Condensed Consolidating Financial Statements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ 5,073	$ 2,066		$ 4,116	$ (1,329)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	3,820	4,076		7,775	8,423
Deferred income taxes				3,294	2,405
Amortization of debt issue costs				1,030	1,137
Amortization of syndication contracts				302	381
Payments on syndication contracts				(651)	(934)
Non-cash stock-based compensation	1,400	700		2,241	998
Other income (loss)
(Gain) loss on debt extinguishment	130	1,230	(400)	130	1,230
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in accounts receivable				(4,327)	(3,771)
(Increase) decrease in amounts due from related party
(Increase) decrease in prepaid expenses and other assets				(454)	(177)
Increase (decrease) in accounts payable, accrued expenses and other liabilities				(637)	(1,998)
Net cash provided by (used in) operating activities				12,819	6,365
Cash flows from investing activities:
Investment in subsidiaries
Purchases of property and equipment and intangibles				(4,605)	(3,647)
Net cash provided by (used in) investing activities				(4,605)	(3,647)
Cash flows from financing activities:
Proceeds from issuance of common stock				2,392
Payments on long-term debt				(50)	(20,600)
Payments of deferred debt and offering costs				(5,620)	(80)
Net cash provided by (used in) financing activities				(3,278)	(20,680)
Net increase (decrease) in cash and cash equivalents				4,936	(17,962)
Cash and cash equivalents:
Beginning				36,130	58,719
Ending	41,066	40,757	58,719	41,066	40,757
Parent [Member]
Cash flows from operating activities:
Net income (loss)	5,073	2,066		4,116	(1,329)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	3,692	3,898		7,505	8,059
Deferred income taxes				(405)	580
Amortization of debt issue costs				1,030	1,137
Amortization of syndication contracts				302	381
Payments on syndication contracts				(651)	(934)
Non-cash stock-based compensation				2,241	998
Other income (loss)
(Gain) loss on debt extinguishment	130	1,230		130	1,230
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in accounts receivable				(4,298)	(3,684)
(Increase) decrease in amounts due from related party				18	(15)
(Increase) decrease in prepaid expenses and other assets				(302)	(223)
Increase (decrease) in accounts payable, accrued expenses and other liabilities				(573)	(1,698)
Net cash provided by (used in) operating activities				9,113	4,502
Cash flows from investing activities:
Investment in subsidiaries				3,460	2,035
Purchases of property and equipment and intangibles				(4,178)	(3,641)
Net cash provided by (used in) investing activities				(718)	(1,606)
Cash flows from financing activities:
Proceeds from issuance of common stock				2,392
Payments on long-term debt				(50)	(20,600)
Payments of deferred debt and offering costs				(5,620)	(80)
Net cash provided by (used in) financing activities				(3,278)	(20,680)
Net increase (decrease) in cash and cash equivalents				5,117	(17,784)
Cash and cash equivalents:
Beginning				35,631	58,276
Ending	40,748	40,492		40,748	40,492
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)	(1,787)	(1,010)		(3,574)	(2,020)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization
Deferred income taxes				3,574	2,020
Amortization of debt issue costs
Amortization of syndication contracts
Payments on syndication contracts
Non-cash stock-based compensation
Other income (loss)
(Gain) loss on debt extinguishment
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in accounts receivable
(Increase) decrease in amounts due from related party
(Increase) decrease in prepaid expenses and other assets
Increase (decrease) in accounts payable, accrued expenses and other liabilities
Net cash provided by (used in) operating activities
Cash flows from investing activities:
Investment in subsidiaries
Purchases of property and equipment and intangibles
Net cash provided by (used in) investing activities
Cash flows from financing activities:
Proceeds from issuance of common stock
Payments on long-term debt
Payments of deferred debt and offering costs
Net cash provided by (used in) financing activities
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents:
Beginning
Ending
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)	31	(80)		114	(15)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	128	178		270	364
Deferred income taxes				125	(195)
Amortization of debt issue costs
Amortization of syndication contracts
Payments on syndication contracts
Non-cash stock-based compensation
Other income (loss)
(Gain) loss on debt extinguishment
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in accounts receivable				(29)	(87)
(Increase) decrease in amounts due from related party				(18)	15
(Increase) decrease in prepaid expenses and other assets				(152)	46
Increase (decrease) in accounts payable, accrued expenses and other liabilities				(64)	(300)
Net cash provided by (used in) operating activities				246	(172)
Cash flows from investing activities:
Investment in subsidiaries
Purchases of property and equipment and intangibles				(427)	(6)
Net cash provided by (used in) investing activities				(427)	(6)
Cash flows from financing activities:
Proceeds from issuance of common stock
Payments on long-term debt
Payments of deferred debt and offering costs
Net cash provided by (used in) financing activities
Net increase (decrease) in cash and cash equivalents				(181)	(178)
Cash and cash equivalents:
Beginning				499	443
Ending	318	265		318	265
Eliminations [Member]
Cash flows from operating activities:
Net income (loss)	1,756	1,090		3,460	2,035
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization
Deferred income taxes
Amortization of debt issue costs
Amortization of syndication contracts
Payments on syndication contracts
Non-cash stock-based compensation
Other income (loss)
(Gain) loss on debt extinguishment
Changes in assets and liabilities, net of effect of acquisitions and dispositions:
(Increase) decrease in accounts receivable
(Increase) decrease in amounts due from related party
(Increase) decrease in prepaid expenses and other assets
Increase (decrease) in accounts payable, accrued expenses and other liabilities
Net cash provided by (used in) operating activities				3,460	2,035
Cash flows from investing activities:
Investment in subsidiaries				(3,460)	(2,035)
Purchases of property and equipment and intangibles
Net cash provided by (used in) investing activities				(3,460)	(2,035)
Cash flows from financing activities:
Proceeds from issuance of common stock
Payments on long-term debt
Payments of deferred debt and offering costs
Net cash provided by (used in) financing activities
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents:
Beginning
Ending