Debt (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Debt (Additional Textual) [Abstract]
Asset based senior secured revolving credit	$ 120.0
Credit facility maturity date	Dec. 21, 2017
Revolving credit borrowing	72.0
Weighted average interest rate	2.85%
Letters of credit outstanding	4.3
Additional committed borrowing capacity	36.5
Capital lease and other obligations	0.5
FCCR testing threshold	13.6
FCCR excess availability	36.5
Amended amortization on real estate component of borrowing base [Member]
Debt (Textual) [Abstract]
Amortization on real estate component of borrowing base	12 years 6 months
Maximum [Member]
Debt (Textual) [Abstract]
Unused commitment fees	0.375%
Fixed charge coverage ratio	15.0
Maximum [Member] | Fixed Charge Coverage Ratio Threshold [Member]
Debt (Textual) [Abstract]
Line of credit facility current borrowing capacity	15.0
Minimum [Member]
Debt (Textual) [Abstract]
Unused commitment fees	0.30%
Fixed charge coverage ratio	10.0
FCCR	1.25%
Minimum [Member] | Fixed Charge Coverage Ratio Threshold [Member]
Debt (Textual) [Abstract]
Line of credit facility current borrowing capacity	$ 10.0