Derivative Financial Instruments Derivative Financial Instruments (Amounts Included in AOCL) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure (Amounts in AOCL) (Details) [Abstract]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		$ (16,587)	$ 13,627	$ 14,126
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	[1]	(14,904)	(30,090)	(4,744)
Reclassification of net loss (gain) on cash flow hedges to income(1)	[1]	1,365	(124)	4,245
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		$ (30,126)	$ (16,587)	$ 13,627

[1] See Note 13–Derivative Financial Instruments for details of the amount of gain/loss recognized in accumulated other comprehensive loss ("AOCL") on derivatives and the amount of gain/loss reclassified from AOCL into income.