Fair Value Measurement (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivative instrument	$ (411)	$ 538	$ 46	$ 11,786
Other Contract | Miscellaneous, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivative instrument	$ 0	602	$ 0	12,289
Other Contract | RLJE | Miscellaneous, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain on derivative instrument		$ 1,500		$ 9,600