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Commitments and Contingencies Warranty Account Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]        
Beginning balance $ 57,532 $ 41,979 $ 60,443 $ 34,862
Assumed liabilities from acquisition 0 0 0 5,742
New product warranties 538 1,464 2,257 2,282
Other changes/adjustments to warranties 6,070 4,437 7,931 8,481
Claims activity (7,434) (2,708) (13,517) (6,816)
Effect of change in exchange rates 406 (1,453) (2) (832)
Ending balance 57,112 43,719 57,112 43,719
Less: current portion of warranty 38,987 29,443 38,987 29,443
Long-term warranty $ 18,125 $ 14,276 $ 18,125 $ 14,276