Debt (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current Maturities:	$ 275	$ 82
Long-term debt:	147,000	60,000
Total debt	147,275	60,082
Other notes payable
Debt Instrument [Line Items]
Current Maturities:	275	82
Bank revolving credit facility
Debt Instrument [Line Items]
Long-term debt:	$ 147,000	$ 60,000