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Statements of Consolidated Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Comprehensive Income Net Of Tax [Abstract]      
Net income $ 20,587 $ 29,286 $ 30,984
Other comprehensive income (loss), net of tax:      
Foreign currency translation adjustment (8,457) 1,680 (7,460)
Recognized net actuarial loss 306 466 256
Gain (loss) on unfunded pension obligations 4,113 (2,670) (3,825)
Gain on pension curtailment 0 3,899 0
Other comprehensive income (loss), net of tax (4,038) 3,375 (11,029)
Less: Other comprehensive income, net of tax attributable to noncontrolling interest 0 19 (50)
Comprehensive income $ 16,549 $ 32,680 $ 19,905