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Commitments and Contingencies Warranty Account Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]        
Beginning balance $ 41,979 $ 41,536 $ 34,862 $ 43,302
Assumed liabilities from acquisition 0 0 5,742 0
New product warranties 1,464 1,568 2,282 3,929
Other changes/adjustments to warranties 4,437 219 8,481 1,901
Claims activity (2,708) (4,248) (6,816) (10,599)
Effect of change in exchange rates (1,453) 735 (832) 1,277
Ending balance 43,719 39,810 43,719 39,810
Less: current portion of warranty 29,443 25,584 29,443 25,584
Long-term warranty $ 14,276 $ 14,226 $ 14,276 $ 14,226