Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued expenses [Abstract]
Accrued employee compensation	$ 15,539	$ 14,689
Other payroll-related expenses	9,980	12,085
Deferred revenue	8,813	10,229
Restructuring reserves	3,155	3,814
Accrued professional fees	2,624	3,066
Accrued customer rebates	1,629	2,154
Accrued sales and use taxes	1,564	1,729
Multiemployer pension withdrawal	1,261	0
Vacant property reserve	725	1,535
Deferred lease costs	607	700
Accrued property taxes	575	568
Accrued interest	228	257
Facility exit reserve	0	120
Other	4,437	4,272
Total	$ 51,137	$ 55,218