Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ 3,033	$ 6,113
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	7,958	8,123
Deferred income taxes	1,029	3,428
Non-cash interest expense	538	369
Amortization of syndication contracts	352	218
Payments on syndication contracts	(360)	(215)
Equity in net (income) loss of nonconsolidated affiliate	98	68
Non-cash stock-based compensation	2,425	2,060
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	9,170	13,581
(Increase) decrease in prepaid expenses and other assets	(6,547)	(1,447)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(780)	(8,992)
Net cash provided by operating activities	16,916	23,306
Cash flows from investing activities:
Proceeds from sale of property and equipment and intangible assets	33
Purchases of property and equipment	(5,710)	(7,296)
Purchases of intangible assets	(3,153)
Purchases of businesses, net of cash acquired	(3,563)	(7,489)
Purchases of marketable securities	(159,403)
Proceeds from marketable securities	25,000
Purchases of investments	(35)	(2,200)
Deposits on acquisitions		(190)
Net cash used in investing activities	(146,831)	(17,175)
Cash flows from financing activities:
Proceeds from stock option exercises	106	526
Tax payments related to shares withheld for share-based compensation plans	(2,239)
Payments on long-term debt	(1,500)	(1,875)
Dividends paid	(8,960)	(5,647)
Repurchase of Class A common stock	(7,660)
Payment of contingent consideration	(2,015)
Net cash used in financing activities	(22,268)	(6,996)
Effect of exchange rates on cash, cash equivalents and restricted cash	(10)	(18)
Net increase (decrease) in cash, cash equivalents and restricted cash	(152,193)	(883)
Cash, cash equivalents and restricted cash:
Beginning	261,854	61,520
Ending	109,661	60,637
Cash payments for:
Interest	6,861	6,959
Income taxes	692	590
Supplemental disclosures of non-cash investing and financing activities:
Capital expenditures financed through accounts payable, accrued expenses and other liabilities	400	579
Contingent consideration included in accounts payable, accrued expenses and other liabilities	$ 15,096	$ 18,300