Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income, including noncontrolling interests	$ 9,880	$ 75,586	$ 26,887	$ 187,590
Other comprehensive loss, net of tax:
Unrealized loss on hedges arising during the period	(14,779)	(9,209)	(23,144)	(9,283)
Reclassification adjustments for loss included in net income	4,255	812	9,186	2,080
Income taxes on unrealized loss on hedges	3,772	2,939	4,974	2,521
Unrealized loss on hedges, net of tax	(6,752)	(5,458)	(8,984)	(4,682)
Foreign currency translation loss	(10,383)	(15,706)	(8,363)	(7,428)
Other comprehensive loss, net of tax	(17,135)	(21,164)	(17,347)	(12,110)
Comprehensive income			9,540	175,480
Less comprehensive income applicable to noncontrolling interests			0	(503)
Comprehensive income (loss) applicable to common shareholders	$ (7,255)	$ 54,422	$ 9,540	$ 174,977