CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 188,751us-gaap_ProfitLoss	$ 151,748us-gaap_ProfitLoss	$ (189,102)us-gaap_ProfitLoss
Foreign currency:
Foreign currency translation continuing operations adjustments, net of tax of $24,818, $(8,086) and $(1,210), respectively	(105,410)	(9,637)	13,071
Foreign currency translation, net of tax	(105,410)	(9,637)	13,071
Pension and other postretirement benefits plans:
Prior service cost recognized in net periodic cost, net of tax of $9, $9 and $8, respectively	(12)	(12)	(12)
Transition obligation recognized in net periodic cost, net of tax of $(2) and $(35) in 2013 and 2012, respectively	0	3	62
Unamortized (loss) gain arising during the period, net of tax of $26,624, $(14,638) and $(2,399), respectively	(48,245)	25,641	2,796
Net loss recognized in net periodic cost, net of tax of $(1,544), $(2,446) and $(2,537), respectively	2,841	4,765	4,621
Settlement, net of tax of $(40) in 2012	0	0	66
Curtailment, net of tax of $44 in 2012	0	0	(74)
Foreign currency translation, net of tax of $(265), $(66) and $58, respectively	709	(177)	(168)
Pension and other postretirement benefits plans adjustment, net of tax	(44,707)	30,220	7,291
Derivatives qualifying as hedges:
Unrealized gain (loss) on derivatives arising during the period, net of tax $(111), $(265) and $(102), respectively	594	(549)	515
Reclassification adjustment on derivatives included in net income, net of tax of $111, $46 and $(3,832), respectively	(594)	930	6,361
Derivatives qualifying as hedges, net of tax	0	381	6,876
Other comprehensive (loss) income, net of tax	(150,117)	20,964	27,238
Comprehensive income (loss)	38,634	172,712	(161,864)
Less: comprehensive income attributable to noncontrolling interest	995	638	888
Comprehensive income (loss) attributable to common shareholders	$ 37,639us-gaap_ComprehensiveIncomeNetOfTax	$ 172,074us-gaap_ComprehensiveIncomeNetOfTax	$ (162,752)us-gaap_ComprehensiveIncomeNetOfTax

Defined benefit plan accumulated other comprehensive income (loss), net of tax, settlement.

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Other Comprehensive Income Defined Benefit Plans Curtailments Net Tax Effect

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Other Comprehensive Income (Loss), Amortization of Prior Service Credit, Net Loss and Initial Obligation, Recognized In Net Periodic Benefit Cost, Net of Tax

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Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Pension and Other Postretirement Benefit Plans, Net of Tax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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