Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands		12 Months Ended
	Jan. 01, 2017	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Organization Consolidation And Presentation [Line Items]
Number of reporting units			6
Number of reportable segments			1	1
Payments for reinsurance					$ 11,100
Transferred liability for unpaid claims					8,300
Loss portfolio transfer		$ 0			2,826	$ 0
Aggregate maximum obligation of reinsurer					17,500
Insurance reserves related to reinsurance claims		5,600	$ 5,600	$ 5,600	6,400
Reinsurance receivable		5,600	5,600	5,600	6,400
Debt issuance cost		9,800	$ 9,800	9,800	9,500
Amortization of debt issuance costs		3,114			$ 2,525	$ 2,277
Construction Services [Member]
Organization Consolidation And Presentation [Line Items]
Revenue recognized using percent of completion			0.94		0.92	0.94
Selling, general and administrative expenses [Member]
Organization Consolidation And Presentation [Line Items]
Shipping and handling costs		152,700			$ 81,600	$ 60,300
Loss portfolio transfer					2,800
Retirement savings expense recorded		4,600			2,400	1,600
Advertising expense		3,700
Interest expense [Member]
Organization Consolidation And Presentation [Line Items]
Amortization of debt issuance costs		3,100			2,500	$ 2,300
Income taxes receivable [Member]
Organization Consolidation And Presentation [Line Items]
Liability for uncertain tax positions					3,000
Prepaid expenses and other current assets [Member]
Organization Consolidation And Presentation [Line Items]
Rebates receivable		21,400	$ 21,400	21,400	13,700
Other long-term assets [Member]
Organization Consolidation And Presentation [Line Items]
Assets held for sale		2,000	2,000	2,000	0
Accounts payable [Member]
Organization Consolidation And Presentation [Line Items]
Book overdrafts		200	200	200	300
Accrued expenses and other liabilities [Member]
Organization Consolidation And Presentation [Line Items]
Warranty liabilities		1,800	1,800	1,800	1,800
Accrued expenses and other liabilities and other long-term liabilities [Member]
Organization Consolidation And Presentation [Line Items]
Deferred rent liability		3,600	3,600	3,600	800
Senior Notes [Member] | Long-term Debt [Member]
Organization Consolidation And Presentation [Line Items]
Debt issuance cost		6,474	6,474	6,474	4,869
Line of Credit [Member] | Other long-term assets [Member]
Organization Consolidation And Presentation [Line Items]
Debt issuance cost		3,300	$ 3,300	$ 3,300	$ 4,600
Rent Expense Not Previously Recognized [Member] | Selling, general and administrative expenses [Member]
Organization Consolidation And Presentation [Line Items]
Out-of-period expense		$ 700
Subsequent Event [Member]
Organization Consolidation And Presentation [Line Items]
Number of reporting units	5