Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 103,700	$ 86,569	$ 55,419
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68,082	63,067	64,250
Amortization of debt issue costs and accretion of discount	2,988	4,316	5,128
Amortization of debt issue costs and accretion of discount	6,161	0	0
Loss on extinguishment of debt	0	2,645	0
Provision for doubtful accounts and sundry losses	3,939	2,112	843
Deferred tax benefit	(6,391)	(4,611)	(4,306)
Share-based compensation	13,570	12,592	9,642
Loss on impairment of software	0	0	11,441
Loss on disposition of property and equipment and other intangibles	893	109	430
Earnings of equity method investment	(936)	(692)	(604)
Dividend received from equity method investment	485	390	0
(Increase) decrease in assets:
Accounts receivable	(7,851)	(18,181)	(2,099)
Prepaid expenses and other assets	(8,770)	(3,911)	(4,048)
Other long-term assets	(1,750)	(4,432)	1,654
Increase (decrease) in liabilities:
Accounts payable and accrued liabilities	(215)	16,057	(870)
Income tax payable	(596)	5,245	(349)
Unearned income	11,504	7,021	8,444
Operating lease liabilities	(6,055)
Other long-term liabilities	1,191	4,438	811
Total adjustments	76,249	86,165	90,367
Net cash provided by operating activities	179,949	172,734	145,786
Cash flows from investing activities
Additions to software	(36,871)	(27,386)	(22,174)
Acquisitions, net of cash acquired	(5,585)	0	(42,836)
Property and equipment acquired	(23,002)	(13,933)	(11,290)
Proceeds from sales of property and equipment	111	19	32
Net cash used in investing activities	(65,347)	(41,300)	(76,268)
Cash flows from financing activities
Proceeds from issuance of long-term debt	0	545,000	0
Debt issuance costs	0	(4,418)	0
Net decrease in short-term borrowings	0	(12,000)	(16,000)
Repayments of borrowings for purchase of equipment and software	(886)	(720)	(2,373)
Dividends paid	(14,420)	(7,273)	(21,762)
Withholding taxes paid on share-based compensation	(8,849)	(2,159)	(1,588)
Repurchase of common stock	(31,822)	(10,000)	(7,671)
Repayment of long-term debt	(14,250)	(613,485)	(19,789)
Net cash used in financing activities	(70,227)	(105,055)	(69,183)
Net increase in cash, cash equivalents and restricted cash	44,375	26,379	335
Cash, cash equivalents and restricted cash at beginning of the period	86,746	60,367	60,032
Cash, cash equivalents and restricted cash at end of the period	131,121	86,746	60,367
Reconciliation of cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash	131,121	60,367	60,367
Supplemental disclosure of cash flow information:
Cash paid for interest	28,233	26,891	25,379
Cash paid for income taxes	18,703	9,750	9,930
Supplemental disclosure of non-cash activities:
Payable due to vendor related to property and equipment and software acquired	$ 2,622	$ 317	$ 1,037