CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$ 151,748	$ (189,102)	$ 324,967
Other comprehensive income (loss), net of tax:
Foreign currency translation, net of tax	(9,637)	13,071	(77,073)
Pension and other postretirement benefits plans adjustment, net of tax	30,220	7,291	(38,802)
Derivatives qualifying as hedges, net of tax	381	6,876	8,005
Other comprehensive income (loss), net of tax	20,964	27,238	(107,870)
Comprehensive income (loss)	172,712	(161,864)	217,097
Less: comprehensive income attributable to noncontrolling interest	638	888	1,241
Comprehensive income (loss) attributable to common shareholders	172,074	(162,752)	215,856
Defined Benefit Pension and Other Postretirement Plans
Other comprehensive income (loss), net of tax:
Foreign currency translation	(177)	(168)	(57)
Prior service cost recognized in net periodic cost, net of tax of $(9),$(8) and $(9)	(12)	(12)	(15)
Transition obligation recognized in net periodic cost, net of tax of $2, $35 and $42	3	62	68
Unamortized gain (loss) arising during the period, net of tax of $14,638, $2,399 and $28,779	25,641	2,796	(50,359)
Net loss recognized in net periodic cost, net of tax of $2,446, $2,537 and $1,399	4,765	4,621	2,488
Settlement, net of tax of $40 and $(2)		66	(3)
Curtailment, net of tax of $(44)		(74)
Divestiture of businesses, net of tax of $4,865			9,076
Comprehensive Income Derivatives Qualifying As Hedges
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on derivatives arising during the period, net of tax $265, $102 and $(830)	(549)	515	(1,920)
Reclassification adjustment on derivatives included in net income, net of tax of $(46), $3,832 and $5,757	930	6,361	9,990
Discontinued operations, net of tax of $(39)			(65)
Foreign Currency
Other comprehensive income (loss), net of tax:
Foreign currency translation	(9,637)	13,071	(53,386)
Foreign currency translation divestiture of businesses			$ (23,687)