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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]                      
Net (loss) income $ 4,009 $ (13,727) $ 7,732 $ (3,647) $ (3,924) $ 7,301 $ 7,906 $ 1,362 $ (5,633) $ 12,645 $ 16,523
Other comprehensive (loss) income:                      
Foreign currency translation adjustment                 (2,108) 2,353 (1,232)
Adjustment to retirement benefit liability, net of tax                 53 (79) (187)
Adjustment to post-retirement healthcare benefit liability, net of tax                 45 (499) 129
Other comprehensive (loss) income                 (2,010) 1,775 (1,290)
Total comprehensive (loss) income                 $ (7,643) $ 14,420 $ 15,233