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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities    
Net income $ 72,422 $ 84,695
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 38,720 37,346
Amortization of debt issue costs and accretion of discount 805 991
Operating lease amortization 3,056 2,938
Provision for expected credit losses and sundry losses 1,795 85
Deferred tax benefit (1,210) (947)
Share-based compensation 9,444 7,235
Gain from sale of assets 0 (778)
Loss on disposition of property and equipment and impairment of software 4,370 1,106
Earnings of equity method investment (1,432) (896)
Dividend received from equity method investment 0 1,183
Loss on valuation of foreign currency 1,046 0
(Increase) decrease in assets:    
Accounts receivable, net 2,759 (48)
Prepaid expenses and other assets (1,972) 1,407
Other long-term assets (3,965) (14)
Increase (decrease) in liabilities:    
Accrued liabilities and accounts payable 7,397 (10,899)
Income tax payable (3,862) (3,398)
Unearned income 1,025 (1,664)
Operating lease liabilities (1,605) (3,438)
Other long-term liabilities 1,109 (2,875)
Total adjustments 57,480 27,334
Net cash provided by operating activities 129,902 112,029
Cash flows from investing activities    
Additions to software (18,918) (21,317)
Acquisition of customer relationships (10,607) (14,750)
Property and equipment acquired (10,051) (8,803)
Proceeds from sales of property and equipment 76 802
Purchase of certificates of deposit (7,264) 0
Proceeds from maturities of available-for-sale debt securities 572 0
Acquisition of available-for-sale debt securities 0 (2,968)
Net cash used in investing activities (46,192) (47,036)
Cash flows from financing activities    
Statutory withholding taxes paid on share-based compensation (5,676) (8,793)
Repayment of short-term borrowings for purchase of equipment and software (853) (1,556)
Dividends paid (7,177) (7,213)
Repurchase of common stock (35,215) (24,388)
Repayment of long-term debt (9,875) (24,919)
Net cash used in financing activities (58,796) (66,869)
Effect of foreign exchange rate on cash, cash equivalents and restricted cash (191) 73
Net increase (decrease) in cash, cash equivalents and restricted cash 24,723 (1,803)
Cash, cash equivalents and restricted cash at beginning of the period 285,917 221,105
Cash, cash equivalents and restricted cash at end of the period 310,640 219,302
Reconciliation of cash, cash equivalents and restricted cash    
Cash and cash equivalents 288,064 199,891
Restricted cash 22,576 19,411
Cash, cash equivalents and restricted cash 310,640 219,302
Supplemental disclosure of cash flow information:    
Cash paid for interest 6,034 10,940
Cash paid for income taxes 12,868 7,835
Supplemental disclosure of non-cash activities:    
Payable due to vendor related to equipment and software acquired $ 0 $ 721