Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued expenses [Abstract]
Accrued employee compensation	$ 14,941	$ 19,680
Other payroll-related expenses	12,085	6,363
Deferred revenue	10,246	12,749
Restructuring reserves	3,814	844
Accrued professional fees	3,066	5,474
Accrued customer rebates	2,154	1,930
Deferred lease costs	2,039	3,452
Accrued sales and use taxes	1,728	1,507
Vacant property reserve	1,535	2,131
Accrued property taxes	625	772
Accrued interest	257	358
Facility exit reserve	120	228
Multiemployer pension withdrawal liability	0	1,846
Other	4,470	3,302
Total	$ 57,080	$ 60,636