Commitments and Contingencies (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 02, 2013 sqft	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Lease Obligations
Total rent expenses		$ 2,400,000	$ 2,400,000	$ 2,300,000
Operating leases
2013		2,301,131
2014		1,050,151
2015		947,916
2016		961,813
2017		975,711
Thereafter		1,237,878
Total		7,474,600
Sublease lease rentals expected to reduce operating lease expense in 2013		1,000,000
Sublease lease rentals expected to reduce operating lease expense in 2014		85,000
Corporate office space
Lease Obligations
Total rent expenses		2,400,000	1,300,000	1,100,000
Portion of leased area subleased to a subtenant (in Square feet)	27,144
Total sublease rent per month	85,000
Onerous contract liability related to sublease		$ 300,000
Vehicle | Minimum
Lease Obligations
Leases periods		12 months
Vehicle | Maximum
Lease Obligations
Leases periods		24 months