Debt (Asset-Based Revolving Credit Facility) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Long-term debt	$ 301,466,000	$ 301,613,000
Asset-based revolving credit facility [Member]
Line of Credit Facility [Line Items]
Covenant description	The Revolving Credit Facility also contains a requirement that we meet a 1:1 fixed-charge coverage ratio (FCCR), applicable only if Availability falls below 10% of the aggregate lending commitments (or $35 million).
Current availability	328,200,000
Dividend restrictions	The Revolving Credit Facility generally permits dividends only if certain conditions are met, including complying with either (i) pro forma Excess Availability (as defined in the Revolving Credit Facility) equal to or exceeding 25% of the aggregate Revolver Commitments (as defined in the Revolving Credit Facility) or (ii) (x) pro forma Excess Availability equal to or exceeding 15% of the aggregate Revolver Commitment and (y) a fixed-charge coverage ratio of 1:1 on a pro forma basis.
Letters of credit outstanding	8,000,000	8,400,000
Maximum borrowings outstanding	15,600,000
Average interest rate on borrowings	1.65%
Asset-based revolving credit facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee rate	0.25%
Asset-based revolving credit facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee rate	0.375%
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.50%
Asset-based revolving credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	2.00%
Asset-based revolving credit facility [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	0.50%
Asset-based revolving credit facility [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	1.00%
Line of Credit [Member] | Asset-based revolving credit facility [Member]
Line of Credit Facility [Line Items]
Long-term debt	0	0
Amount outstanding	0	0
Line of Credit [Member] | Asset-based revolving credit facility [Member] | Wells Fargo Capital Finance, LLC [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 350,000,000