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Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ 0	$ 57
Net income	18,164	3,703
Other comprehensive income (loss):
Foreign currency translation adjustment	1,906	4,632
Derivative financial instruments adjustment	(285)	374
Amortization of prior service costs and net gains or losses	2,612	1,950
Other comprehensive income (loss)	4,233	6,956
Comprehensive income (loss)	22,397	10,659
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(144)	224
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	$ 762	$ 1,111

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and 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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