Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gross	$ (77,120)	$ (123,114)	$ (98,839)
Deferred tax expense (benefit)	(17,232)	(34,685)	(26,624)
Net	(59,888)	(88,429)	(72,215)
Current year activity:
Other comprehensive income (loss) before reclassifications	(36,074)	39,385	(28,391)
Amounts reclassified from accumulated other comprehensive income	3,417	6,609	4,116
Net current period other comprehensive income (loss) before tax	(32,657)	45,994	(24,275)
Deferred taxes on current period activity	(10,308)us-gaap_OtherComprehensiveIncomeLossTax	17,453us-gaap_OtherComprehensiveIncomeLossTax	(8,061)us-gaap_OtherComprehensiveIncomeLossTax
Subtotal activity	(22,349)	28,541	(16,214)
Gross	(109,777)	(77,120)	(123,114)
Deferred tax expense (benefit)	(27,540)	(17,232)	(34,685)
Net	(82,237)	(59,888)	(88,429)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gross	(106)	350	1,450
Deferred tax expense (benefit)	(1,440)	(1,280)	(895)
Net	1,334	1,630	2,345
Current year activity:
Other comprehensive income (loss) before reclassifications	3,475	622	141
Amounts reclassified from accumulated other comprehensive income	87	(1,078)	(1,241)
Net current period other comprehensive income (loss) before tax	3,562	(456)	(1,100)
Deferred taxes on current period activity	1,318	(160)	(385)
Subtotal activity	2,244	(296)	(715)
Gross	3,456	(106)	350
Deferred tax expense (benefit)	(122)	(1,440)	(1,280)
Net	3,578	1,334	1,630
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gross	(77,301)	(127,541)	(105,236)
Deferred tax expense (benefit)	(15,792)	(33,405)	(25,729)
Net	(61,509)	(94,136)	(79,507)
Current year activity:
Other comprehensive income (loss) before reclassifications	(35,109)	42,553	(27,662)
Amounts reclassified from accumulated other comprehensive income	3,330	7,687	5,357
Net current period other comprehensive income (loss) before tax	(31,779)	50,240	(22,305)
Deferred taxes on current period activity	(11,626)	17,613	(7,676)
Subtotal activity	(20,153)	32,627	(14,629)
Gross	(109,080)	(77,301)	(127,541)
Deferred tax expense (benefit)	(27,418)	(15,792)	(33,405)
Net	(81,662)	(61,509)	(94,136)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gross	287	4,077	4,947
Deferred tax expense (benefit)	0	0	0
Net	287	4,077	4,947
Current year activity:
Other comprehensive income (loss) before reclassifications	(4,440)	(3,790)	(870)
Amounts reclassified from accumulated other comprehensive income	0	0	0
Net current period other comprehensive income (loss) before tax	(4,440)	(3,790)	(870)
Deferred taxes on current period activity	0	0	0
Subtotal activity	(4,440)	(3,790)	(870)
Gross	(4,153)	287	4,077
Deferred tax expense (benefit)	0	0	0
Net	(4,153)	287	4,077
Foreign Exchange Forward [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gross	(87)	253	1,399
Deferred tax expense (benefit)	(1,433)	(1,314)	(913)
Net	1,346	1,567	2,312
Current year activity:
Other comprehensive income (loss) before reclassifications	3,456	618	693
Amounts reclassified from accumulated other comprehensive income	87	(958)	(1,839)
Net current period other comprehensive income (loss) before tax	3,543	(340)	(1,146)
Deferred taxes on current period activity	1,311	(119)	(401)
Subtotal activity	2,232	(221)	(745)
Gross	3,456	(87)	253
Deferred tax expense (benefit)	(122)	(1,433)	(1,314)
Net	3,578	1,346	1,567
Precious Metal Contracts [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gross	(19)	97	51
Deferred tax expense (benefit)	(7)	34	18
Net	(12)	63	33
Current year activity:
Other comprehensive income (loss) before reclassifications	19	4	(552)
Amounts reclassified from accumulated other comprehensive income	0	(120)	598
Net current period other comprehensive income (loss) before tax	19	(116)	46
Deferred taxes on current period activity	7	(41)	16
Subtotal activity	12	(75)	30
Gross	0	(19)	97
Deferred tax expense (benefit)	0	(7)	34
Net	$ 0	$ (12)	$ 63

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Accumulated Other comprehensive Income (Loss), Tax

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Amount before tax of increase (decrease) in accumulated in equity from transactions and other events and circumstances from non-owner sources. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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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 before tax, after 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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