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Commitments and Contingencies Warranty Account Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Warranty Activity [Line Items]    
Beginning balance $ 54,512 $ 36,548
New product warranties 2,404 1,800
Other changes/adjustments to warranties 1,034 3,445
Claims activity (7,390) (2,773)
Effect of change in exchange rates 182 (1,955)
Ending balance 50,742 37,065
Less: current portion of warranty 32,244 22,256
Long-term warranty $ 18,498 $ 14,809