Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Schedule of Deferred Loan Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Write-off of deferred financing costs	$ 0	$ 351	$ 0
Amended and restated credit agreement
Debt Instrument [Line Items]
Write-off of deferred financing costs	0	351
Deferred financing costs capitalized	$ 195	$ 2,162