Long-Term Debt (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Dec. 18, 2011	Aug. 18, 2011
Long-Term Debt (Textual) [Abstract]
Convertible notes	$ 113,441,000	$ 94,650,000
Long-Term Debt (Additional Textual) [Abstract]
Credit agreement amendment date	Mar. 19, 2012
Line of credit original expiration date	2016-08
Line of credit facility extended expiration year	2017-03
Deferred financing costs	348,000
Maximum swing loans available under revolving credit facility	7,000,000
Variable LIBOR rate	1.97%
Variable base rate	1.96%
Maximum leverage ratio	3.25
Minimum leverage ratio	1.00
Maximum required leverage ratio under credit facility	3.00
Minimum required leverage ratio under credit facility	1.00
Maximum leverage ratio at credit facility expiration	2.75
Minimum leverage ratio at credit facility expiration	1.00
Maximum fixed charge coverage ratio	1.20
Minimum fixed charge coverage ratio	1.00
Stock price trigger for convertible note prepay option	140.00%
Commencement of prepay period of convertible notes outstanding	Aug. 17, 2014
Revolving credit facility [Member]
Long-Term Debt (Textual) [Abstract]
Maximum borrowings under revolver				105,000,000
Commitment fee on the daily unused portion of the Revolver	0.25%
Convertible notes	70,350,000	29,350,000
Revolving credit facility [Member] | Maximum [Member]
Long-Term Debt (Textual) [Abstract]
Maximum borrowings under revolver	130,000,000
Revolving credit facility [Member] | Minimum [Member]
Long-Term Debt (Textual) [Abstract]
Minimum incremental increase in revolver capacity	10,000,000
Term loan [Member]
Long-Term Debt (Textual) [Abstract]
Maximum borrowings under revolver				20,000,000
Quarterly term loan payments	750,000
Convertible notes	20,000,000	40,000,000
Convertible promissory notes [Member]
Long-Term Debt (Textual) [Abstract]
Interest rate on convertible notes			4.00%
Conversion stock price for Convertible Notes	$ 47.1675
Convertible notes	20,000,000	20,000,000		20,000,000
Maturity date of Convertible Notes	Aug. 17, 2017
Swing loan credit facility [Member]
Long-Term Debt (Textual) [Abstract]
Convertible notes	$ 3,091,000	$ 5,300,000