Derivative Financial Instruments (Derivative Gains Included In Accumulated Other Comprehensive Loss (AOCL) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative Gains Included in AOCI [Roll Forward]
Beginning balance		$ (32,741)	$ (42,216)	$ (34,776)	$ (30,126)
Net gain (loss) on cash flow hedges	[1]	(2,802)	(8,631)	(1,507)	(21,109)
Reclassification of net loss (gain) on cash flow hedges to income	[1]	739	388	1,479	776
Ending balance		$ (34,804)	$ (50,459)	$ (34,804)	$ (50,459)

[1] See Note 8–Derivative Financial Instruments for details of the amount of gain/loss recognized in accumulated other comprehensive loss (“AOCL”) for derivative financial instruments and the amount of gain/loss reclassified from AOCL into income.