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property and equipment and investments in intangible assets, partially offset by the sale of available-for-sale investments and maturity of certificates of deposit. Net cash used in
investing activities in 2013 was primarily attributable to business acquisitions, purchase of available-for-sale investments and certificates of deposit, purchases of property and
equipment and investments in intangible assets, partially offset by the sale of available-for-sale investments and maturity of certificates of deposit.
Net cash (used in) provided by financing activities was $(67.4) million , $327.5 million and $(35.7) million for the year ended December 31, 2015 , 2014 and 2013 ,
respectively. Net cash used in financing activities in 2015 was primarily attributable to dividends paid, deferred payments for acquisitions and the repurchase of stock, partially offset
by the exercise of stock options and excess tax benefit from share-based compensation. Net cash provided by financing activities in 2014 was primarily attributable to the proceeds
from the sale of the Convertible Notes, proceeds from the exercise of stock options and excess tax benefit from share-based compensation, partially offset by dividends paid, deferred
payments for acquisitions and the repurchase of stock. Net cash used in financing activities in 2013 was primarily attributable to dividends paid and the repurchase of stock, partially
offset by the exercise of stock options and excess tax benefit from share-based compensation.
Stock Repurchase Program
Effective February 15, 2012, our Board of Directors authorized the repurchase of up to five million shares of our common stock through February 20, 2013 (see Note 22 -
Subsequent Events for discussion regarding the extension of the share repurchase program to February 20, 2017).
Contractual Obligations and Commitments
The following table summarizes our contractual obligations and commitments as of December 31, 2015 :
Payment Due by Period (in thousands)
Contractual Obligations
1 Year
2-3 Years
4-5 Years
More than 5
Years
Total
Long-term debt - principal (a)
$ —
$ —
$ 250,000
$ 402,500
$ 652,500
Long-term debt - interest (b)
33,081
66,163
65,885
6,541
171,670
Operating leases (c)
10,033
18,926
12,342
12,962
54,263
Capital leases (d)
140
44
7
—
191
Telecom services and co-location facilities (e)
2,383
1,877
81
—
4,341
Holdback payment (f)
23,176
—
—
—
23,176
Contingent consideration (g)
20,000
—
—
—
20,000
Other (h)
793
40
—
—
833
Total
$ 89,606
$ 87,050
$ 328,315
$ 422,003
$ 926,974
________________________
(a) These amounts represent principal on long-term debt.
(b) These amounts represent interest on long-term debt.
(c) These amounts represent undiscounted future minimum rental commitments under noncancellable operating leases.
(d) These amounts represent undiscounted future minimum rental commitments under noncancellable capital leases.
(e) These amounts represent service commitments to various telecommunication providers.
(f) These amounts represent the holdback amounts in connection with certain business acquisitions.
(g) These amounts represent the contingent earn-out liabilities in connection with certain business acquisitions.
(h) These amounts primarily represent certain consulting and Board of Director fee arrangements, software license commitments and others.
As of December 31, 2015 , our liability for uncertain tax positions was $35.9 million . The future payments related to uncertain tax positions have not been presented in the
table above due to the uncertainty of the amounts and timing of cash settlement with the taxing authorities. In addition, with the acquisition of Ookla, acquired on December 1, 2014
(see Note 3 - Business Acquisitions), contingent consideration of up to an aggregate of $40.0 million may be payable upon achieving certain future income thresholds and was
determined to have a fair value of $25.0 million as of December 31, 2015. Due to the Company achieving certain earnings targets for the year ended December 31, 2015, $20.0
million has been reclassified to current liabilities in the consolidated balance sheet payable in 2016 and has been included in the table above. The remaining $5.0 million of
contingent
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