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Commitments and Contingencies Warranty Account Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Beginning balance $ 34,862 $ 43,302
Assumed liabilities from acquisition 5,742 0
New product warranties 818 2,361
Other changes/adjustments to warranties 4,044 1,682
Claims activity (4,108) (6,351)
Effect of change in exchange rates 621 542
Ending balance 41,979 41,536
Less: current portion of warranty 26,533 23,500
Long-term warranty $ 15,446 $ 18,036