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Warranties (Product Warranty Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Product Warranties Disclosures [Abstract]    
Warranty liabilities, beginning balance $ 34,226 $ 33,386
Warranty claims (61,819) (52,297)
Warranty accruals 62,816 53,137
Warranty liabilities, ending balance $ 35,223 $ 34,226