Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 85,298	$ 60,082
Less current maturities	119	82
Total long-term debt	85,179	60,000
Capital lease obligations
Debt Instrument [Line Items]
Total debt	298	0
Other notes payable
Debt Instrument [Line Items]
Total debt	0	82
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement | Unsecured Debt
Debt Instrument [Line Items]
Total debt	$ 85,000	$ 60,000