Accrued Expenses (Accrued Expenses) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Expenses [Abstract]
Compensation	$ 17,837	$ 26,459
Customer rebates	9,530	9,102
Insurance	8,136	8,740
Other	11,929	16,386
Total accrued expenses	$ 47,432	$ 60,687