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Changes in Warranty Reserve (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Warranty Reserve [Roll Forward]    
Beginning balance $ 14,881 $ 12,447
Warranty expense 33,727 30,370
Warranty claims (31,245) (27,936)
Ending balance $ 17,363 $ 14,881