Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ 0	$ (1,595)
Total debt	(2,000)	(210,405)
Less current maturities	400	208,805
Total long-term debt	1,600	1,600
Senior Subordinated 6.25% Notes
Debt Instrument [Line Items]
Total debt	0	(210,000)
Other debt
Debt Instrument [Line Items]
Total debt	$ (2,000)	$ (2,000)