Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accumulated Other Comp Inc (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 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	34,329	$ (62,754)
Balance at the end of the period	3,904,320
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	34,131	(68,386)
Amounts reclassified from accumulated other comprehensive income (loss)	198	5,632
Other comprehensive income (loss), net of tax	34,329	(62,754)
Balance at the end of the period	(13,264)	14,768
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)	93	93
Other comprehensive income (loss), net of tax	93	93
Balance at the end of the period	(1,577)	(1,951)
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	769	153
Other comprehensive income (loss), net of tax	769	153
Balance at the end of the period	455	15,149
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)	105	174
Other comprehensive income (loss), net of tax	105	174
Balance at the end of the period	(6,463)	(7,089)
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	33,362	(68,539)
Amounts reclassified from accumulated other comprehensive income (loss)		5,365
Other comprehensive income (loss), net of tax	33,362	(63,174)
Balance at the end of the period	$ (5,679)	$ 8,659