Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Total debt
Long-term debt	$ 51,078	$ 58,828
Amounts payable within one year	1,078	0
Long-term debt, noncurrent	50,000	58,828
Term loan [Member]
Total debt
Long-term debt	30,000	57,750
Revolving credit facility [Member]
Total debt
Long-term debt	20,000	0
Secured debt of affiliate [Member]
Total debt
Long-term debt	$ 1,078	$ 1,078