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Unaudited Consolidated Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities    
Net income $ 66,322 $ 49,494
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation and amortization 47,383 48,189
Amortization of debt issue costs and accretion of discount 3,410 3,828
Provision for doubtful accounts and sundry losses 1,065 452
Deferred tax benefit (2,734) (6,338)
Share-based compensation 9,692 6,579
Loss on impairment of software 0 6,473
Loss on disposition of property and equipment and other intangibles 12 229
Earnings of equity method investment (612) (413)
Dividend received from equity method investment 390 0
(Increase) decrease in assets:    
Accounts receivable, net (64) 5,446
Prepaid expenses and other assets (4,462) (3,813)
Other long-term assets (280) 1,447
(Decrease) increase in liabilities:    
Accounts payable and accrued liabilities (3,674) (9,127)
Income tax payable 4,278 2,990
Unearned income 7,655 4,570
Other long-term liabilities 62 (1,571)
Total adjustments 62,121 58,941
Net cash provided by operating activities 128,443 108,435
Cash flows from investing activities    
Additions to software (15,385) (15,955)
Acquisitions, net of cash acquired 0 (42,836)
Property and equipment acquired (9,620) (8,285)
Proceeds from sales of property and equipment 15 30
Net cash used in investing activities (24,990) (67,046)
Cash flows from financing activities    
Statutory withholding taxes paid on share-based compensation (2,128) (1,576)
Net (decrease) increase in short-term borrowings (12,000) 5,000
Repayment of short-term borrowing for purchase of equipment and software (686) (1,872)
Dividends paid (3,636) (21,762)
Repurchase of common stock 0 (7,671)
Repayment of long-term debt (41,374) (14,748)
Net cash used in financing activities (59,824) (42,629)
Net increase (decrease) in cash, cash equivalents and restricted cash 43,629 (1,240)
Cash, cash equivalents and restricted cash at beginning of the period 60,367 60,032
Cash, cash equivalents and restricted cash at end of the period 103,996 58,792
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 91,310 48,440
Restricted cash 12,686 10,352
Cash, cash equivalents and restricted cash 60,367 60,032
Supplemental disclosure of cash flow information:    
Cash paid for interest 19,923 18,991
Cash paid for income taxes 7,150 7,493
Supplemental disclosure of non-cash activities:    
Payable due to vendor related to software acquired $ 330 $ 1,420