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Basis of Presentation and Significant Accounting Policies - Summary of Changes in Warranty Liability (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]    
Warranty liability, beginning of period $ 18,117 $ 18,155
Warranty provision during period 3,288 3,057
Warranty payments during period (6,140) (3,767)
Warranty charges related to construction services projects 128 594
Warranty liability, end of period $ 15,393 $ 18,039