Condensed Consolidating Financial Statements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 7,697	$ 7,233	$ 2,066	$ (3,395)	$ (2,032)	$ (1,384)	$ (352)	$ (4,432)	$ 13,601	$ (8,200)	$ (18,086)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization									16,426	18,653	19,229
Impairment charge											36,109
Deferred income taxes									6,477	4,565	(4,342)
Amortization of debt issuance costs									2,284	2,207	1,140
Amortization of syndication contracts									707	1,482	1,159
Payments on syndication contracts									(1,698)	(1,976)	(2,724)
Equity in net (income) loss of nonconsolidated affiliate											180
Non-cash stock-based compensation									2,651	2,343	2,970
Other (income) loss										(687)
(Gain) loss on debt extinguishment									3,743	423	934
Reserve for note receivable											3,018
Change in fair value of interest rate swap agreements											(12,188)
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in restricted cash										809	(809)
(Increase) decrease in accounts receivable									(3,740)	(574)	2,091
(Increase) decrease in prepaid expenses and other assets									321	336	310
Increase (decrease) in accounts payable, accrued expenses and other liabilities									(740)	(1,770)	8,134
Net cash provided by (used in) operating activities									40,032	17,611	37,125
Cash flows from investing activities:
Purchases of property and equipment and intangibles									(9,856)	(8,524)	(8,650)
Purchase of a business										(598)
Net cash provided by (used in) investing activities									(9,856)	(9,122)	(8,650)
Cash flows from financing activities:
Proceeds from issuance of common stock									23	42	239
Payments on long-term debt									(61,800)	(17,071)	(362,949)
Termination of swap agreements											(4,039)
Proceeds from borrowings on long-term debt									20,000		394,888
Dividends paid									(10,313)	(5,102)
Payments of capitalized debt offering and issuance costs									(675)	(29)	(11,890)
Net cash provided by (used in) financing activities									(52,765)	(22,160)	16,249
Net increase (decrease) in cash and cash equivalents									(22,589)	(13,671)	44,724
Cash and cash equivalents:
Beginning				58,719				72,390	58,719	72,390	27,666
Ending	36,130				58,719				36,130	58,719	72,390
Parent [Member]
Cash flows from operating activities:
Net income (loss)									13,601	(8,200)	(18,086)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization									15,743	17,839	18,417
Impairment charge											11,992
Deferred income taxes									2,470	883	1,994
Amortization of debt issuance costs									2,284	2,207	1,140
Amortization of syndication contracts									707	1,482	1,159
Payments on syndication contracts									(1,698)	(1,976)	(2,724)
Equity in net (income) loss of nonconsolidated affiliate											180
Non-cash stock-based compensation									2,651	2,343	2,970
Other (income) loss										(687)
(Gain) loss on debt extinguishment										423	934
Reserve for note receivable											3,018
Change in fair value of interest rate swap agreements											(12,188)
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in restricted cash										809	(809)
(Increase) decrease in accounts receivable									(3,808)	(505)	2,051
(Increase) decrease in amounts due from related party									394	1,300	184
(Increase) decrease in prepaid expenses and other assets									517	283	389
Increase (decrease) in accounts payable, accrued expenses and other liabilities									(552)	(1,965)	7,930
Net cash provided by (used in) operating activities									36,052	14,236	18,551
Cash flows from investing activities:
Purchases of property and equipment and intangibles									(9,818)	(8,333)	(7,158)
Investment in subsidiaries									3,886	2,991	17,238
Purchase of a business										(598)
Net cash provided by (used in) investing activities									(5,932)	(5,940)	10,080
Cash flows from financing activities:
Proceeds from issuance of common stock									23	42	239
Payments on long-term debt									(61,800)	(17,071)	(362,949)
Termination of swap agreements											(4,039)
Proceeds from borrowings on long-term debt									20,000		394,888
Dividends paid									(10,313)	(5,102)
Payments of capitalized debt offering and issuance costs									(675)	(29)	(11,890)
Net cash provided by (used in) financing activities									(52,765)	(22,160)	16,249
Net increase (decrease) in cash and cash equivalents									(22,645)	(13,864)	44,880
Cash and cash equivalents:
Beginning				58,276				72,140	58,276	72,140	27,260
Ending	35,631				58,276				35,631	58,276	72,140
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)									(3,962)	(3,423)	(12,143)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Impairment charge											15,368
Deferred income taxes									3,962	3,423	(3,225)
Other (income) loss
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in restricted cash
Cash flows from investing activities:
Purchase of a business
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)									76	432	(5,095)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization									683	814	812
Impairment charge											8,749
Deferred income taxes									45	259	(3,111)
Other (income) loss
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in restricted cash
(Increase) decrease in accounts receivable									68	(69)	40
(Increase) decrease in amounts due from related party									(394)	(1,300)	(184)
(Increase) decrease in prepaid expenses and other assets									(196)	53	(79)
Increase (decrease) in accounts payable, accrued expenses and other liabilities									(188)	195	204
Net cash provided by (used in) operating activities									94	384	1,336
Cash flows from investing activities:
Purchases of property and equipment and intangibles									(38)	(191)	(1,492)
Purchase of a business
Net cash provided by (used in) investing activities									(38)	(191)	(1,492)
Cash flows from financing activities:
Net increase (decrease) in cash and cash equivalents									56	193	(156)
Cash and cash equivalents:
Beginning				443				250	443	250	406
Ending	499				443				499	443	250
Eliminations [Member]
Cash flows from operating activities:
Net income (loss)									3,886	2,991	17,238
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Other (income) loss
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in restricted cash
Net cash provided by (used in) operating activities									3,886	2,991	17,238
Cash flows from investing activities:
Investment in subsidiaries									(3,886)	(2,991)	(17,238)
Purchase of a business
Net cash provided by (used in) investing activities									$ (3,886)	$ (2,991)	$ (17,238)