Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Total debt
Long-term debt	$ 36,078	$ 36,078
Amounts payable within one year	0	0
Long-term debt, noncurrent	36,078	36,078
Term loan [Member]
Total debt
Long-term debt	30,000	30,000
Revolving credit facility [Member]
Total debt
Long-term debt	5,000	5,000
Secured debt of affiliate [Member]
Total debt
Long-term debt	$ 1,078	$ 1,078