Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	$ (157,416)	$ (38,000)	$ (157,416)	$ (38,000)	$ (59,488)	$ (27,700)
Other comprehensive income loss before reclassifications			19,700	(11,000)
Amounts reclassified from accumulated other comprehensive income loss			(117,700)	800
Net current period other comprehensive income loss	(56,391)	(11,309)	(97,928)	(10,242)
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	(1,600)	500	(1,600)	500	(400)	5,600
Other comprehensive income loss before reclassifications			(2,200)	1,400
Amounts reclassified from accumulated other comprehensive income loss			1,000	(6,500)
Net current period other comprehensive income loss			(1,200)	(5,100)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	31,600	41,100	31,600	41,100	71,700	(23,700)
Other comprehensive income loss before reclassifications			78,600	57,500
Amounts reclassified from accumulated other comprehensive income loss			(118,700)	7,300
Net current period other comprehensive income loss			(40,100)	64,800
Accumulated Defined Benefit Plans Adjustment
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	(27,000)	(18,300)	(27,000)	(18,300)	(31,600)	(19,600)
Other comprehensive income loss before reclassifications			4,600	1,300
Amounts reclassified from accumulated other comprehensive income loss			0	0
Net current period other comprehensive income loss			4,600	1,300
Accumulated Translation Adjustment
Accumulated other comprehensive income [Line Items]
Accumulated other comprehensive income (loss), net of tax	$ (160,500)	$ (61,200)	(160,500)	(61,200)	$ (99,200)	$ 10,000
Other comprehensive income loss before reclassifications			(61,300)	(71,200)
Amounts reclassified from accumulated other comprehensive income loss			0	0
Net current period other comprehensive income loss			$ (61,300)	$ (71,200)