Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 2,013,009
Balance	2,748,787	$ 2,013,009
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	174,507	173,872
Other comprehensive income (loss) before reclassifications	12,729	(4,251)
Amounts reclassified from accumulated other comprehensive income (loss)	(125,255)	4,886
Balance	61,981	174,507
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		(3,878)
Other comprehensive income (loss) before reclassifications		3,878
Unrealized/Recognized Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	174,507	177,750
Other comprehensive income (loss) before reclassifications	12,729	(8,129)
Amounts reclassified from accumulated other comprehensive income (loss)	(125,255)	4,886
Balance	$ 61,981	$ 174,507