Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Aug. 18, 2015	Dec. 31, 2014
Total debt
Long-term debt	$ 36,365		$ 36,078
Amounts payable within one year	0		0
Long-term debt, noncurrent	36,365		36,078
Term loan [Member]
Total debt
Long-term debt	0		30,000
Revolving credit facility [Member]
Total debt
Long-term debt	0	$ 100,000	5,000
Long-term debt, noncurrent	35,287		0
Secured debt of affiliate [Member]
Total debt
Long-term debt	$ 1,078		$ 1,078