Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Supplemental Balance Sheet, Income Statement and Cash Flow Information
Losses (gains) on sales, disposals and involuntary conversions of long-lived assets	$ 11,114	$ 1,934	$ 13,546	$ 5,344
Termination of employment contract				45,000
Litigation expenses	567	(502)	3,627	5,659
Foreign currency transaction losses (gains)	4,336	2,990	1,043	7,307
Other losses (gains)	487	4,820	(236)	5,669
Losses (gains) on sales and retirements of long-lived assets and other expense (income), net	16,504	9,242	17,980	68,979
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			(23,965)	(47,656)
Other comprehensive income (loss) before reclassifications, tax portion			93	70
Amount reclassified from accumulated other comprehensive income (loss)			(3,622)	(84,923)
Other comprehensive income (loss), net of tax	28,087	(44,127)	(27,587)	(132,579)
Balance at the end of the period	188,552	207,564	188,552	207,564
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)			187	187
Other comprehensive income (loss), net of tax			187	187
Balance at the end of the period	(2,232)	(2,606)	(2,232)	(2,606)
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			(19,626)	4,913
Amount reclassified from accumulated other comprehensive income (loss)			(3,960)	(85,454)
Other comprehensive income (loss), net of tax			(23,586)	(80,541)
Balance at the end of the period	48,156	53,688	48,156	53,688
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)			151	344
Other comprehensive income (loss), net of tax			151	344
Balance at the end of the period	(3,924)	(7,288)	(3,924)	(7,288)
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			(4,339)	(52,569)
Other comprehensive income (loss), net of tax			(4,339)	(52,569)
Balance at the end of the period	$ 146,553	$ 163,770	$ 146,553	$ 163,770