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Consolidated Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities      
Net income (loss) $ 85,377 $ 66,157 $ (27,117)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 64,974 65,988 70,366
Amortization of debt issue costs and accretion of discount 3,329 3,094 3,905
Write-off of debt issue costs, premium and discount accounted as loss on extinguishment of debt     16,555
Provision for doubtful accounts and sundry losses 2,130 1,360 673
Deferred tax benefit (3,090) (3,701) (3,419)
Share-based compensation 5,204 4,587 6,179
Unrealized (gain) loss on indemnification assets (14) 446 383
Loss on disposition of property and equipment and other intangibles 143 734 538
Earnings of equity method investment (147) (1,140) (935)
Dividend received from equity method investment   326 984
(Increase) decrease in assets:      
Accounts receivable, net (4,482) (5,587) 13,646
Prepaid expenses and other assets (132) (381) 447
Other long-term assets (70) 3,365 (1,381)
Increase (decrease) in liabilities:      
Accounts payable and accrued liabilities 7,596 (697) (19,480)
Income tax payable (606) 1,697 (2,700)
Unearned income 2,207 3,571 3,966
Total adjustments 77,042 73,662 89,727
Net cash provided by operating activities 162,419 139,819 62,610
Cash flows from investing activities      
Net increase in restricted cash (6,100) (285) (494)
Additions to software and purchase of customer relationship (25,960) (14,707) (16,727)
Property and equipment acquired (21,022) (10,898) (11,692)
Proceeds from sales of property and equipment 14 59 16
Net cash used in investing activities (53,068) (25,831) (28,897)
Cash flows from financing activities      
Proceeds from initial public offering, net of offering costs of $12,567     112,432
Proceeds from issuance of long-term debt     700,000
Debt issuance costs     (12,077)
Net (decrease) increase in short-term borrowings (6,000) (27,000) 36,000
Proceeds from new short-term borrowing for purchase of equipment     1,800
Repayments of borrowing for purchase of equipment (1,542) (1,200) (13,596)
Dividends paid (30,921) (31,359) (16,390)
Statutory minimum withholding taxes paid on share-based compensation (306) (2,001) (16,851)
Tax windfall benefits on share-based compensation   3,669 1,829
Issuance of common stock   543 29
Repurchase of common stock (54,949) (26,197) (75,000)
Settlement of stock options   (1,604)  
Repayment and repurchase of long-term debt (19,000) (19,000) (755,024)
Repayment of other financing agreement     (224)
Net cash (used in) provided by financing activities (112,718) (104,149) (37,072)
Net (decrease) increase in cash (3,367) 9,839 (3,359)
Cash at beginning of the period 32,114 22,275 25,634
Cash at end of the period 28,747 32,114 22,275
Supplemental disclosure of cash flow information:      
Cash paid for interest 21,497 24,280 41,340
Cash paid for income taxes 5,682 976 2,340
Supplemental disclosure of non-cash activities:      
Payable due to vendor related to property and equipment and software acquired $ 3,638 $ 6,115 $ 3,006