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Commitments and Contingencies Warranty Account Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]        
Beginning balance $ 57,112 $ 43,719 $ 60,443 $ 34,862
Assumed liabilities from acquisition 0 0 0 5,742
New product warranties 1,388 869 3,645 3,151
Other changes/adjustments to warranties 4,603 659 12,533 9,141
Claims activity (8,453) (2,164) (21,970) (8,981)
Effect of change in exchange rates (768) 277 (769) (555)
Ending balance 53,882 43,360 53,882 43,360
Less: current portion of warranty 38,018 29,736 38,018 29,736
Long-term warranty $ 15,864 $ 13,624 $ 15,864 $ 13,624