Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 16,546	$ 12,704
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,158	14,160
Stock-based compensation	5,524	4,262
Equity investment loss (income)	483	(105)
Deferred income taxes	732	456
Loss on disposals of long-lived assets	882	1,558
Other	280	312
Changes in operating assets and liabilities:
Accounts receivable, net of allowance for bad debt	(6,138)	560
Prepaid expenses and other assets	(558)	(1,445)
Income tax receivable	(3,197)	(757)
Accounts payable	(4,541)	(1,812)
Accrued liabilities	1,555	(1,430)
Income taxes payable	(1,710)	(559)
Deferred revenue	2,539	1,355
Net cash provided by operating activities	25,555	29,259
Investing activities
Capital expenditures	(4,691)	(6,535)
Capitalized program development costs and other assets	(658)	(3,005)
Proceeds from sale of real property	0	1,493
Net cash used in investing activities	(5,349)	(8,047)
Financing activities
Cash paid for repurchase of common stock	(1,815)	(1,404)
Cash received from issuance of common stock	0	100
Net cash used in financing activities	(1,815)	(1,304)
Net increase in cash and cash equivalents	18,391	19,908
Cash and cash equivalents at beginning of period	179,205	146,351
Cash and cash equivalents at end of period	197,596	166,259
Supplemental disclosure of cash flow information
Income taxes paid	$ 10,041	$ 10,528