Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accumulated Other Comp Inc (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			$ 4,282,710
Other comprehensive income (loss), net of tax	$ (3,675)	$ (46,719)	35,668	$ (99,085)
Balance at the end of the period	3,591,929		3,591,929
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(47,593)	77,522
Other comprehensive income (loss) before reclassifications, net of tax			31,421	(105,252)
Amounts reclassified from accumulated other comprehensive income (loss)			4,247	6,167
Other comprehensive income (loss), net of tax			35,668	(99,085)
Balance at the end of the period	(11,925)	(21,563)	(11,925)	(21,563)
Gains (losses) on cash flow hedges
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(1,670)	(2,044)
Amounts reclassified from accumulated other comprehensive income (loss)			472	280
Other comprehensive income (loss), net of tax			472	280
Balance at the end of the period	(1,198)	(1,764)	(1,198)	(1,764)
Unrealized gains (losses) on available-for-sale securities.
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(314)	14,996
Other comprehensive income (loss) before reclassifications, net of tax			3,551	(10,127)
Amounts reclassified from accumulated other comprehensive income (loss)			3,495
Other comprehensive income (loss), net of tax			7,046	(10,127)
Balance at the end of the period	6,732	4,869	6,732	4,869
Defined benefit pension plan items
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(6,568)	(7,263)
Amounts reclassified from accumulated other comprehensive income (loss)			280	522
Other comprehensive income (loss), net of tax			280	522
Balance at the end of the period	(6,288)	(6,741)	(6,288)	(6,741)
Foreign currency items
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period			(39,041)	71,833
Other comprehensive income (loss) before reclassifications, net of tax			27,870	(95,125)
Amounts reclassified from accumulated other comprehensive income (loss)				5,365
Other comprehensive income (loss), net of tax			27,870	(89,760)
Balance at the end of the period	$ (11,171)	$ (17,927)	$ (11,171)	$ (17,927)