Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Balance Sheet, Income Statement and Cash Flow Information
Losses (gains) on sales, disposals and involuntary conversions of long-lived assets	$ 2,432	$ 3,411
Termination of employment contract		45,000
Litigation expenses	3,060	6,161
Foreign currency transaction losses (gains)	(3,293)	4,317
Other losses (gains)	(723)	848
Losses (gains) on sales and retirements of long-lived assets and other expense (income), net	1,476	59,737
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	216,140	340,143
Other comprehensive income (loss) before reclassifications, net of tax	(55,842)	(13,196)
Other comprehensive income (loss) before reclassifications, tax portion		70
Amount reclassified from accumulated other comprehensive income (loss)	168	(75,256)
Other comprehensive income (loss), net of tax	(55,674)	(88,452)
Balance at the end of the period	160,466	251,691
Gains (losses) on cash flow hedges
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	(2,419)	(2,793)
Amount reclassified from accumulated other comprehensive income (loss)	93	94
Other comprehensive income (loss), net of tax	93	94
Balance at the end of the period	(2,326)	(2,699)
Unrealized gains (losses) on available-for-sale securities
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	71,742	134,229
Other comprehensive income (loss) before reclassifications, net of tax	(19,248)	10,069
Amount reclassified from accumulated other comprehensive income (loss)		(75,523)
Other comprehensive income (loss), net of tax	(19,248)	(65,454)
Balance at the end of the period	52,494	68,775
Defined benefit pension plan items
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	(4,075)	(7,632)
Amount reclassified from accumulated other comprehensive income (loss)	75	173
Other comprehensive income (loss), net of tax	75	173
Balance at the end of the period	(4,000)	(7,459)
Foreign currency items
Accumulated other comprehensive income (loss)
Balance at the beginning of the period	150,892	216,339
Other comprehensive income (loss) before reclassifications, net of tax	(36,594)	(23,265)
Other comprehensive income (loss), net of tax	(36,594)	(23,265)
Balance at the end of the period	$ 114,298	$ 193,074