Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 25,625	$ 27,122	$ 133,825
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,989	14,663	14,953
Impairment charge		735
Deferred income taxes	15,664	17,585	(134,975)
Amortization of debt issuance costs	797	820	1,647
Amortization of syndication contracts	360	440	587
Payments on syndication contracts	(510)	(578)	(1,258)
Non-cash stock-based compensation	5,240	4,351	4,771
(Gain) loss on debt extinguishment	204	246	29,675
Changes in assets and liabilities:
(Increase) decrease in trade receivables	871	(6,128)	(8,706)
(Increase) decrease in prepaid expenses and other current assets	(499)	(1,183)	(509)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(1,458)	(3,661)	(7,255)
Net cash provided by operating activities	62,283	54,412	32,755
Cash flows from investing activities:
Purchases of property and equipment and intangibles	(13,696)	(8,609)	(10,174)
Purchase of a business, net of cash acquired		(15,048)
Net cash used in investing activities	(13,696)	(23,657)	(10,174)
Cash flows from financing activities:
Proceeds from stock option exercises	2,177	1,841	2,806
Payments on long-term debt	(23,750)	(23,750)	(375,984)
Dividends paid	(9,350)	(8,865)	(11,014)
Repurchase of Class A common stock		(12,543)
Payment of contingent consideration	(1,000)
Proceeds from borrowings on long-term debt			375,000
Payments of capitalized debt offering and issuance costs			(5,697)
Net cash used in financing activities	(31,923)	(43,317)	(14,889)
Net increase (decrease) in cash and cash equivalents	16,664	(12,562)	7,692
Cash and cash equivalents:
Beginning	31,260	43,822	36,130
Ending	47,924	31,260	43,822
Cash payments for:
Interest	12,249	15,265	32,586
Income taxes	$ 750	$ 859	$ 838