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Commitments and Contingencies - Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Changes in the warranty liability:    
Beginning of the period $ 21,911 $ 20,380
Assumed from business acquisition 0 1,813
Provision 5,124 3,177
Settlements (4,567) (3,428)
Currency translation (412) (190)
End of the period $ 22,056 $ 21,752