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Commitments and Contingencies Warranty Account Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Beginning balance $ 60,443 $ 34,862
Assumed liabilities from acquisition 0 5,742
New product warranties 1,718 818
Other changes/adjustments to warranties 1,861 4,044
Claims activity (6,083) (4,108)
Effect of change in exchange rates (407) 621
Ending balance 57,532 41,979
Less: current portion of warranty 39,737 26,533
Long-term warranty $ 17,795 $ 15,446