Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Supplemental Balance Sheet, Income Statement and Cash Flow Information
Losses (gains) on sales, disposals and involuntary conversions of long-lived assets	$ (749)	$ 11,114	$ 2,725	$ 13,546
Net gain on Merger			(52,574)
Litigation expenses	2,133	567	(1,944)	3,627
Foreign currency transaction losses (gains)	1,797	4,336	(548)	1,043
Other losses (gains)	(1,843)	487	(2,163)	(236)
Losses (gains) on sales and retirements of long-lived assets and other expense (income), net	1,338	16,504	(54,504)	17,980
Estimated gross gain in merger			102,200
Merger transaction expenses			49,600
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period			77,522	216,140
Other comprehensive income (loss) before reclassifications, net of tax			(58,266)	(23,965)
Amounts reclassified from accumulated other comprehensive income (loss)			5,900	(3,623)
Other comprehensive income (loss), net of tax	10,388	28,087	(52,366)	(27,587)
Balance at the end of the period	25,156	188,552	25,156	188,552
Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period			(2,044)	(2,419)
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	(1,857)	(2,232)	(1,857)	(2,232)
Unrealized gains (losses) on available-for-sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period			14,996	71,742
Other comprehensive income (loss) before reclassifications, net of tax			(2,000)	(19,626)
Amounts reclassified from accumulated other comprehensive income (loss)				(3,961)
Other comprehensive income (loss), net of tax			(2,000)	(23,587)
Balance at the end of the period	12,996	48,155	12,996	48,155
Defined benefit pension plan items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period			(7,263)	(4,075)
Amounts reclassified from accumulated other comprehensive income (loss)			348	151
Other comprehensive income (loss), net of tax			348	151
Balance at the end of the period	(6,915)	(3,924)	(6,915)	(3,924)
Foreign currency items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at the beginning of the period			71,833	150,892
Other comprehensive income (loss) before reclassifications, net of tax			(56,266)	(4,339)
Amounts reclassified from accumulated other comprehensive income (loss)			5,365
Other comprehensive income (loss), net of tax			(50,901)	(4,339)
Balance at the end of the period	$ 20,932	$ 146,553	$ 20,932	$ 146,553