Revolving Credit Facility (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Minimum	Dec. 31, 2012 Line of Credit	Dec. 31, 2011 Line of Credit	Dec. 31, 2012 Letter of Credit	Dec. 31, 2012 Additional line of credit capacity allowed	Dec. 31, 2012 Current Revolving Credit Facility
Line of Credit Facility
Maximum Borrowing Capacity					$ 60,000,000	$ 350,000,000	$ 300,000,000
Percentage of eligible accounts receivable for borrowing base			85.00%
Percentage of eligible inventory for borrowing base			65.00%
Percentage of net orderly liquidation value of eligible inventory			85.00%
Percentage of eligible machinery and equipment for borrowing base			85.00%
Available borrowing capacity	266,700,000	30,000,000
Remaining available borrowing capacity	259,800,000
Outstanding Line of Credit			$ 0	$ 0	$ 6,900,000
Interest On Line Of Credit	4.00%
Fixed charge coverage ratio to be maintained on a consolidated basis	1.1:1.0