CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated net gain (loss) on cash flow derivative hedges at beginning of year	$ (84,505)	$ (33,258)	$ 42,848
Net (loss) gain on cash flow derivative hedges	197,428	58,138	70,480
Net (gain) loss reclassified into earnings	(69,599)	(109,385)	(146,586)
Accumulated net gain (loss) on cash flow derivative hedges at end of year	$ 43,324	$ (84,505)	$ (33,258)