Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Aug. 18, 2011
Schedule of Long-Term Debt
Long-term debt current and noncurrent	$ 113,441	$ 94,650
Less current portion of long-term debt	750	3,000
Long-term debt	112,691	91,650
Revolving credit facility [Member]
Schedule of Long-Term Debt
Long-term debt current and noncurrent	70,350	29,350
Term loan [Member]
Schedule of Long-Term Debt
Long-term debt current and noncurrent	20,000	40,000
Convertible promissory notes [Member]
Schedule of Long-Term Debt
Long-term debt current and noncurrent	20,000	20,000	20,000
Swing loan credit facility [Member]
Schedule of Long-Term Debt
Long-term debt current and noncurrent	$ 3,091	$ 5,300