Fair Value of Financial Instruments, Derivatives and Fair Value Disclosures (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative Instruments in Hedges, Assets, at Fair Value		$ 1,164
Derivative Instruments in Hedges, Liabilities, at Fair Value	$ (12,841)	(2,629)
Interest Rate Cap/Collar [Member] | Other Noncurrent Assets [Member]
Derivative Instruments in Hedges, Assets, at Fair Value		704
Derivative Instruments in Hedges, Liabilities, at Fair Value	(1,680)
Interest Rate Cap/Collar [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative Instruments in Hedges, Assets, at Fair Value		460
Derivative Instruments in Hedges, Liabilities, at Fair Value	(1,050)
Interest Rate Swap [Member] | Other Noncurrent Liabilities [Member]
Derivative Instruments in Hedges, Liabilities, at Fair Value	(7,873)	(1,922)
Interest Rate Swap [Member] | Accounts Payable and Accrued Liabilities [Member]
Derivative Instruments in Hedges, Liabilities, at Fair Value	$ (2,238)	$ (707)