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Changes in Warranty Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Product Warranty, Increase (Decrease) [Roll Forward]        
Warranty reserves, beginning of period $ 1,650 $ 1,325 $ 1,600 $ 1,325
Warranty provision 847 947 1,199 1,456
Warranty expenditures (647) (897) (949) (1,406)
Warranty reserves, end of period $ 1,850 $ 1,375 $ 1,850 $ 1,375
Other Construction Components        
Product Warranty Liability [Line Items]        
Limited warranty period     1 year  
Structural Elements        
Product Warranty Liability [Line Items]        
Limited warranty period     10 years