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Commitments and Contingencies (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Changes to the asset retirement obligation liability            
Asset retirement obligations, beginning of period $ 1,870   $ 1,918 $ 1,679 $ 1,918 $ 1,636
Liabilities incurred 63     27 63 65
Liabilities settled (200)     (27) (200) (53)
Accretion expense 5     17 21 56
Foreign currency translation 32     (25) (32) (33)
Asset retirement obligations, end of period 1,770 1,870   1,671 1,770 1,671
Changes in the warranty liability:            
Warranty liability, beginning of period 4,243 4,821 5,184 4,832 5,184 4,970
Provision for warranties issued during the period 5,251 4,116 4,575 5,218 13,942 14,630
Settlements made during the period (5,258) (4,694) (4,938) (4,687) (14,890) (14,237)
Less: Amount classified as Liabilities Held for Sale (839)       (839)  
Warranty liability, end of period 3,397 4,243 4,821 5,363 3,397 5,363
As Reported
           
Changes in the warranty liability:            
Warranty liability, beginning of period   4,821 5,184   5,184  
Provision for warranties issued during the period   (215) 1,632      
Settlements made during the period   (363) (1,995)      
Warranty liability, end of period   $ 4,243 $ 4,821      
Minimum
           
Product Warranties            
Warranty period         1 year  
Maximum
           
Product Warranties            
Warranty period         5 years