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Summary of Significant Accounting Policies Warranty Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Warranty Costs [Abstract]    
Warranty liability, beginning of period $ 51,135 $ 65,512
Accrued warranty expense 21,092 23,019
Changes in estimates related to pre-existing warranties (1,820) (9,966)
Cost of warranty service work performed (29,342) (27,389)
Acquisitions 321 4,488
Foreign exchange translation effect (3,979) (4,529)
Warranty liability, end of period $ 37,407 $ 51,135