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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Comprehensive Income (Loss)      
Net income (loss) $ (42,263) $ 30,928 $ 127,987
Available-for-sale securities      
Unrealized gain (loss) on available-for-sale securities 34 (118) 393
Benefit (provision) for income taxes 11 50 (79)
Less: Reclassification adjustments for gains included in net income (loss) (61) (24) (271)
Net unrealized gain (loss) on available-for-sale securities (16) (92) 43
Minimum pension liability      
Minimum pension liability 125 (216) (73)
Benefit (provision) for income taxes (86) 79 30
Net minimum pension liability 39 (137) (43)
Foreign currency translation      
Foreign currency translation (1,322) (1,071) 1,228
Benefit (provision) for income taxes (53) 683 (434)
Net foreign currency translation (1,375) (388) 794
Other comprehensive income (loss), net of tax (1,352) (617) 794
Comprehensive income (loss) $ (43,615) $ 30,311 $ 128,781