2012 Incentive Compensation Plan (Details Textual) (USD $)	1 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2012	Apr. 29, 2011	Jun. 30, 2012	Jun. 30, 2012	Jun. 06, 2012	Dec. 31, 2011
2012 Incentive compensation plan (Textual) [Abstract]
Common stock repurchased by the company, shares	830,925		830,925	830,925		830,925
Common stock, shares issued	9,895,462		9,895,462	9,895,462		9,895,462
2012 Incentive Compensation Plan (Additional Textual) [Abstract]
Common stock, par value	$ 0.001		$ 0.001	$ 0.001		$ 0.001
Number of shares granted under SAR Award Agreement	543,872		543,872	543,872
Valuation dates of common stock under SAR award agreement, description				commence after May 30, 2012 and prior to May 30, 2022
Common stock, market value per share	$ 22.07		$ 22.07	$ 22.07
Expenses for the SAR granted			$ 56,000
Expected term				6 years
Risk-free interest rate	0.92%			0.54%
Anticipated volatility factor and zero dividend yield		50.00%		55.00%
Dividend yield				0
Discount on valuation of trading activity					15.00%
Weighted average fair values of individual SARs granted				$ 3.31
Resulting fair value of each SAR per share				$ 3.31
Total unrecognized compensation cost	$ 1,700,000		$ 1,700,000	$ 1,700,000
Expected period of recognition of cost				3 years
Service period				1 year 9 months 11 days
2012 Plan [Member]
2012 Incentive compensation plan (Textual) [Abstract]
Common stock, shares issued	0		0	0
Stock Appreciation Rights (SARs) [Member]
2012 Incentive compensation plan (Textual) [Abstract]
Common stock repurchased by the company, shares	830,925		830,925	830,925