Long - Term Debt (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Loans payable	Jun. 30, 2012 Loans payable Asset-based loan	Apr. 27, 2011 Loans payable Asset-based loan	Apr. 27, 2011 Loans payable Asset-based loan Percentage In excess of Federal Funds Effective Rate related to cash borrowings outstanding	Apr. 27, 2011 Loans payable Asset-based loan Percentage in excess of LIBOR related to cash borrowings outstanding	Apr. 27, 2011 Loans payable Asset-based loan Margin in addition to base rate for cash borrowings outstanding Minimum	Apr. 27, 2011 Loans payable Asset-based loan Margin in addition to base rate for cash borrowings outstanding Maximum	Apr. 27, 2011 Loans payable Asset-based loan Margin in addition to LIBOR for cash borrowings outstanding Minimum	Apr. 27, 2011 Loans payable Asset-based loan Margin in addition to LIBOR for cash borrowings outstanding Maximum
Long-term debt:
Long-term debt, gross	$ 77,000	$ 77,000
Less: current maturities	0	0
Long-term debt	77,000	77,000
Term of asset based loan				5 years
Maximum borrowing capacity					250,000
Minimum total borrowing availability threshold before implementation of cash dominion and weekly borrowing base reporting					42,000
Minimum total borrowing availability threshold before implementation of cash dominion, weekly borrowing base reporting and fixed charge coverage ratio					35,000
Unused borrowing capicity before additional capicity subject to cash dominion and weekly reporting covenants				22,742
Amount of additional capacity subject to cash dominion and weekly reporting covenants				7,000
Total borrowing availability				29,742
Unused borrowing capacity dependent on meeting the fixed charge coverage ratio				$ 35,000
Basis spread on variable rate						0.50%	1.00%	1.00%	1.75%	2.25%	3.00%
Weighted average interest rate			3.19%