Debt (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current Maturities	$ 17	$ 82
Long-term Debt	119,000	60,000
Total debt	119,017	60,082
Other notes payable
Debt Instrument [Line Items]
Current Maturities	17	82
Bank revolving credit facility
Debt Instrument [Line Items]
Long-term Debt	$ 119,000	$ 60,000