Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 61,634	$ (10,222)	$ 3,778
Other comprehensive income before reclassifications	(164,722)	76,995	(40,671)
Tax effect	17,359us-gaap_OtherComprehensiveIncomeLossTax	(16,633)us-gaap_OtherComprehensiveIncomeLossTax	15,984us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive income before reclassifications, net of tax	(147,363)	60,362	(24,687)
Amounts reclassified out of AOCI	25,526	17,093	16,059
Tax effect	(8,937)	(5,599)	(5,372)
Amounts reclassified out of AOCI, net of tax	16,589	11,494	10,687
Other comprehensive income (loss)	(130,774)	71,856	(14,000)
Ending Balance	(69,140)	61,634	(10,222)
Pension and Other Post-Retirement Actuarial Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(129,918)	(178,956)	(149,197)
Other comprehensive income before reclassifications	(60,602)	52,545	(57,072)
Tax effect	18,117	(16,334)	16,626
Other comprehensive income before reclassifications, net of tax	(42,485)	36,211	(40,446)
Amounts reclassified out of AOCI	25,604	19,112	16,059
Tax effect	(8,961)	(6,285)	(5,372)
Amounts reclassified out of AOCI, net of tax	16,643	12,827	10,687
Other comprehensive income (loss)	(25,842)	49,038	(29,759)
Ending Balance	(155,760)	(129,918)	(178,956)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	190,998	167,461	152,894
Other comprehensive income before reclassifications	(106,295)	23,537	14,567
Tax effect	0	0	0
Other comprehensive income before reclassifications, net of tax	(106,295)	23,537	14,567
Amounts reclassified out of AOCI	0	0	0
Tax effect	0	0	0
Amounts reclassified out of AOCI, net of tax	0	0	0
Other comprehensive income (loss)	(106,295)	23,537	14,567
Ending Balance	84,703	190,998	167,461
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	554	1,273	81
Other comprehensive income before reclassifications	2,175	913	1,834
Tax effect	(758)	(299)	(642)
Other comprehensive income before reclassifications, net of tax	1,417	614	1,192
Amounts reclassified out of AOCI	(78)	(2,019)	0
Tax effect	24	686	0
Amounts reclassified out of AOCI, net of tax	(54)	(1,333)	0
Other comprehensive income (loss)	1,363	(719)	1,192
Ending Balance	$ 1,917	$ 554	$ 1,273

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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The tax effect of amounts reclassified out of accumulated other comprehensive income.

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