Quarterly report pursuant to Section 13 or 15(d)

Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Details)

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Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Components of comprehensive income (loss)      
Net income (loss) $ (17,753) $ 31,849  
Currency translation gain (loss) (7,966) 3,105  
Total comprehensive income (loss) (25,546) 34,998  
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets      
Foreign currency translation gain 10,141   18,107
Total Accumulated other comprehensive income 4,227   12,020
Defined benefit pension plans
     
Components of comprehensive income (loss)      
Amortization of postretirement benefit plan and defined benefit pension plans 102 115  
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets      
Defined benefit postretirement plan and defined benefit pension plans adjustments (7,980)   (8,082)
Defined benefit postretirement pension plan
     
Components of comprehensive income (loss)      
Amortization of postretirement benefit plan and defined benefit pension plans 71 (71)  
The components of Accumulated other comprehensive income on the Condensed Consolidated Balance Sheets      
Defined benefit postretirement plan and defined benefit pension plans adjustments $ 2,066   $ 1,995