CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated net gain (loss) on cash flow derivative hedges at beginning of year	$ (826,026)	$ 43,324	$ (84,505)
Net (loss) gain on cash flow derivative hedges	(697,671)	(919,094)	188,073
Net (gain) loss reclassified into earnings	291,624	49,744	(60,244)
Accumulated net gain (loss) on cash flow derivative hedges at end of year	$ (1,232,073)	$ (826,026)	$ 43,324