Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Total debt
Long-term debt	$ 58,828	$ 69,078
Amounts payable within one year		3,000
Long-term debt, noncurrent	58,828	66,078
Term loan [Member]
Total debt
Long-term debt	57,750	58,500
Revolving credit facility [Member]
Total debt
Long-term debt		9,500
Secured debt of affiliate [Member]
Total debt
Long-term debt	$ 1,078	$ 1,078