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Commitments and Contingencies Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2013
Product Warranty Liability [Line Items]              
Standard and Extended Product Warranty Accrual $ 27,732 $ 14,282 $ 12,671       $ 12,291
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued 10,452 8,812 7,311        
Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties 3,304 5,160 5,223        
Standard and Extended Product Warranty Accrual, Period Increase (Decrease) 19,409 0 0        
Standard and Extended Product Warranty Accrual, Decrease for Payments (19,715) (12,361) $ (12,154)        
Product Liability Accrual, Component Amount 19,400 $ 500   $ 14,500 $ 2,800 $ 2,200  
Estimated Repair Costs for Affected Homes $ 11,900