Commitments and Contingencies (Details Textual) (USD $)	1 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies (Textual) [Abstract]
Rent expense		$ 1,800,000	$ 1,700,000
Severance payment	170,000
Proceeds received related to short swing trading profits			359,000
Company's stock worth		20,500
Plaintiffs' legal costs		106,000
Plaintiffs claim to have suffered property damages and other loss		75,000,000
Loss contingency reserve accrual		0
Liability for amount completely withdrawn from the Unions Pension Trust Fund		$ 5,300,000