Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 20,405	$ 25,625	$ 27,122
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,342	15,989	14,663
Impairment charge			735
Deferred income taxes	12,528	15,664	17,585
Amortization of debt issuance costs	776	797	820
Amortization of syndication contracts	398	360	440
Payments on syndication contracts	(388)	(510)	(578)
Non-cash stock-based compensation	5,035	5,240	4,351
(Gain) loss on debt extinguishment	161	204	246
Changes in assets and liabilities:
(Increase) decrease in trade receivables	1,397	871	(6,128)
(Increase) decrease in prepaid expenses and other current assets	439	(499)	(1,183)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	1,203	(1,458)	(3,661)
Net cash provided by operating activities	57,296	62,283	54,412
Cash flows from investing activities:
Purchases of property and equipment and intangibles	(9,053)	(13,696)	(8,609)
Purchase of a business, net of cash acquired			(15,048)
Purchases of short term investments: CDs	(30,000)
Proceeds from short term investments: CDs	30,000
Purchases of investments	(500)
Net cash used in investing activities	(9,553)	(13,696)	(23,657)
Cash flows from financing activities:
Payments on long-term debt	(23,750)	(23,750)	(23,750)
Dividends paid	(11,177)	(9,350)	(8,865)
Repurchase of Class A common stock			(12,543)
Payment of contingent consideration		(1,000)
Net cash used in financing activities	(34,147)	(31,923)	(43,317)
Proceeds from stock option exercises, net	780	2,177	1,841
Net increase (decrease) in cash and cash equivalents	13,596	16,664	(12,562)
Cash and cash equivalents:
Beginning	47,924	31,260	43,822
Ending	61,520	47,924	31,260
Cash payments for:
Interest	14,693	12,249	15,265
Income taxes	593	750	859
Supplemental disclosures of non-cash investing and financing activities:
Capital expenditures financed through accounts payable, accrued expenses and other liabilities	$ 1,068	$ 813	$ 960