Long-Term Debt (Debt Outstanding) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total	$ 82,500
Current portion of long-term debt	(10,000)	$ (8,750)
Long-term debt	72,500	$ 100,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total	5,000
Term Notes [Member]
Debt Instrument [Line Items]
Total	$ 77,500