Debt (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jul. 02, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	May. 30, 2014	Dec. 13, 2013
Debt Instrument [Line Items]
Letters of credit		$ 4,300,000		$ 4,300,000
Interest rate during period		4.74%	4.63%	3.55%	4.10%
Long-term Debt		$ 215,284,000		$ 215,284,000		$ 237,109,000
Loan Agreement
Debt Instrument [Line Items]
Remaining amount available under the line of credit		180,400,000		180,400,000
Long-term Debt		115,284,000		115,284,000		137,109,000
Less unamortized deferred financing fees
Debt Instrument [Line Items]
Unamortized debt issuance expense		$ 549,000		$ 549,000		$ 680,000
Loan Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity on line of credit							$ 300,000,000	$ 200,000,000
Company borrowed under loan agreement to fund Scepter acquisition	$ 135,300,000