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Commitments and Contingencies - Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Changes in the warranty liability:    
Beginning of the period $ 27,573 $ 21,911
Provision 7,364 5,124
Settlements (6,552) (4,567)
Currency translation 468 (412)
End of the period $ 28,853 $ 22,056