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Warranties (Product Warranty Liabilities) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Product Warranties Disclosures [Abstract]  
Balance at December 31, 2014 $ 34,226
Warranty claims (25,972)
Warranty accruals 22,709
Balance at June 30, 2015 $ 30,963