Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accumulated Other Comp Inc (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	$ 5,014	$ 10,388	39,343	$ (52,366)
Balance at the end of the period	3,715,850		3,715,850
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			38,869	(58,266)
Amounts reclassified from accumulated other comprehensive income (loss)			474	5,900
Other comprehensive income (loss), net of tax			39,343	(52,366)
Balance at the end of the period	(8,250)	25,156	(8,250)	25,156
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)			187	187
Other comprehensive income (loss), net of tax			187	187
Balance at the end of the period	(1,483)	(1,857)	(1,483)	(1,857)
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			2,049	(2,000)
Other comprehensive income (loss), net of tax			2,049	(2,000)
Balance at the end of the period	1,735	12,996	1,735	12,996
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)			287	348
Other comprehensive income (loss), net of tax			287	348
Balance at the end of the period	(6,281)	(6,915)	(6,281)	(6,915)
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			36,820	(56,266)
Amounts reclassified from accumulated other comprehensive income (loss)				5,365
Other comprehensive income (loss), net of tax			36,820	(50,901)
Balance at the end of the period	$ (2,221)	$ 20,932	$ (2,221)	$ 20,932