Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Lease Obligations
Future operating lease payments	$ 64,280,000
Future Lease Payments
2013	9,378,000
2014	9,802,000
2015	9,672,000
2016	8,100,000
2017	4,406,000
Thereafter	22,922,000
Total	64,280,000
Rent expense
Rent expense, net of sub-lease income	8,500,000	8,400,000	8,700,000
Sub-lease income from non-restructured facilities	0	36,000	35,000
MicroEdge
Lease Obligations
Future operating lease payments	7,400,000
Future minimum rental receipts under non-cancelable sub-leases	1,700,000
Future Lease Payments
Total	$ 7,400,000