Changes in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Changes in accumulated other comprehensive loss by component
Accumulated comprehensive (loss) income at beginning of the year			$ (896,994)	$ 5,671
Other comprehensive (loss) income before reclassifications			(503,727)	(366,086)
Amounts reclassified from accumulated other comprehensive (loss) income			204,332	19,526
Total other comprehensive loss	$ (223,365)	$ (269,559)	(299,395)	(346,560)
Ending balance	(1,196,389)	(340,889)	(1,196,389)	(340,889)
Changes related to cash flow derivative hedges
Changes in accumulated other comprehensive loss by component
Accumulated comprehensive (loss) income at beginning of the year			(826,026)	43,324
Other comprehensive (loss) income before reclassifications			(483,946)	(339,415)
Amounts reclassified from accumulated other comprehensive (loss) income			202,978	16,236
Total other comprehensive loss			(280,968)	(323,179)
Ending balance	(1,106,994)	(279,855)	(1,106,994)	(279,855)
Changes in defined benefit plans
Changes in accumulated other comprehensive loss by component
Accumulated comprehensive (loss) income at beginning of the year			(31,207)	(23,994)
Other comprehensive (loss) income before reclassifications			4,213	(6,829)
Amounts reclassified from accumulated other comprehensive (loss) income			1,354	1,293
Total other comprehensive loss			5,567	(5,536)
Ending balance	(25,640)	(29,530)	(25,640)	(29,530)
Foreign currency translation adjustments
Changes in accumulated other comprehensive loss by component
Accumulated comprehensive (loss) income at beginning of the year			(39,761)	(13,659)
Other comprehensive (loss) income before reclassifications			(23,994)	(19,842)
Amounts reclassified from accumulated other comprehensive (loss) income			0	1,997
Total other comprehensive loss			(23,994)	(17,845)
Ending balance	$ (63,755)	$ (31,504)	$ (63,755)	$ (31,504)