Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 84,695	$ 37,900
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,346	35,634
Amortization of debt issue costs and accretion of discount	991	1,074
Operating lease amortization	2,938	2,890
Provision for expected credit losses and sundry losses	85	922
Deferred tax benefit	(947)	(1,214)
Share-based compensation	7,235	7,122
Gain from sale of assets	(778)	0
Loss on disposition of property and equipment and impairment of intangible	1,106	193
Earnings of equity method investment	(896)	(531)
Dividend received from equity method investment	1,183	0
Decrease (increase) in assets:
Accounts receivable, net	(48)	14,387
Prepaid expenses and other assets	1,407	(4,102)
Other long-term assets	(14)	1,141
(Decrease) increase in liabilities:
Accrued liabilities and accounts payable	(10,899)	(13,653)
Income tax payable	(3,398)	4,988
Contract liability	(1,664)	2,817
Operating lease liabilities	(3,438)	(3,281)
Other long-term liabilities	(2,875)	965
Total adjustments	27,334	49,352
Net cash provided by operating activities	112,029	87,252
Cash flows from investing activities
Additions to software	(21,317)	(11,833)
Acquisition of customer relationship	(14,750)	0
Property and equipment acquired	(8,803)	(6,614)
Proceeds from sales of property and equipment	802	0
Acquisition of available-for-sale debt securities	(2,968)	0
Net cash used in investing activities	(47,036)	(18,447)
Cash flows from financing activities
Statutory withholding taxes paid on share-based compensation	(8,793)	(2,777)
Net borrowings under Revolving Facility	0	15,000
Repayment of short-term borrowings for purchase of equipment and software	(1,556)	(1,553)
Dividends paid	(7,213)	(7,193)
Repurchase of common stock	(24,388)	(7,300)
Repayment of long-term debt	(24,919)	(24,123)
Net cash used in financing activities	(66,869)	(27,946)
Effect of foreign exchange rate on cash, cash equivalents and restricted cash	73	(2,890)
Net (decrease) increase in cash, cash equivalents and restricted cash	(1,803)	37,969
Cash, cash equivalents and restricted cash at beginning of the period	221,105	131,121
Cash, cash equivalents and restricted cash at end of the period	219,302	169,090
Reconciliation of cash, cash equivalents and restricted cash
Cash and cash equivalents	199,891	146,920
Restricted cash	19,411	22,170
Cash, cash equivalents and restricted cash	219,302	169,090
Supplemental disclosure of cash flow information:
Cash paid for interest	10,940	12,352
Cash paid for income taxes	7,835	4,579
Supplemental disclosure of non-cash activities:
Payable due to vendor related to equipment and software acquired	$ 721	$ 1,484