Debt (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current Maturities	$ 189	$ 82
Long-term debt	101,000	60,000
Total debt	101,189	60,082
Other notes payable
Debt Instrument [Line Items]
Current Maturities	189	82
Bank revolving credit facility
Debt Instrument [Line Items]
Long-term debt	$ 101,000	$ 60,000