Stock Based Compensation (Details Textual) (USD $)	12 Months Ended										12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011 Employees	Dec. 31, 2010	Dec. 31, 2012 Restricted stock [Member]	Dec. 31, 2011 Restricted stock [Member]	Dec. 31, 2010 Restricted stock [Member]	Dec. 31, 2012 Stock options [Member]	Dec. 31, 2011 Stock options [Member]	Dec. 31, 2010 Stock options [Member]	Dec. 31, 2012 Performance shares [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Maximum [Member] Restricted stock [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Minimum [Member] Restricted stock [Member]	Dec. 31, 2012 Class A [Member]	Dec. 31, 2010 Class A [Member] Employees	Dec. 31, 2009 Class A [Member] Employees
Maximum shares of common stock provided	4,000,000									116,841
Maximum shares that may be issued pursuant to options or restricted stock grants															3,481,569
Vesting period of shares	4 years			3 years							4 years	4 years	3 years	1 year
Maximum vesting period							5 years
Maximum vesting period							10 years
Estimated fair value of options		$ 12.00														$ 11.00
Stock compensation expense attributable to stock based awards	$ 100,000	$ 2,400,000	$ 900,000	$ 100,000	$ 200,000	$ 200,000	$ (700,000)	$ 2,100,000	$ 600,000
Weighted average remaining requisite service period of unvested stock awards	2 years 9 months 29 days			2 years 2 months 23 days
Defer issuance term				2 years
Vesting Period, beginning date				Mar. 19, 2012
Vesting period, end date				Apr. 15, 2015
Additional restricted stock vesting				116,841
Restricted stock or unit expenses	758,000			700,000	44,000	100,000
Unrecognized compensation expense related to unvested restricted stock and restricted stock units				3,000,000
Fair value of option shares vested	300,000	1,000,000	2,400,000
Fair value of restricted stock and restricted stock units vested				44,000	44,000	46,330
Restricted stock grants				13,833
Company repurchased shares																117,505
Repurchased common stock, price per share																$ 11.00
Number of Employees																13	10
Number of options, Options forfeited	(248,000)			(408,000)
Stock Based Compensation (Textual) [Abstract]
Additional general and administration expenses		1,100,000
Weighted average grant date fair value for options	$ 5.95		$ 3.02
Aggregate intrinsic value	0
Aggregate intrinsic value exercisable	0
Quoted closing market price	$ 8.20
Weighted average contractual term	1 year 22 days
Total intrinsic value of options exercised	900,000	200,000	2,200,000
Tax related benefits realized from the exercise of stock options	0	0	800,000
Options expired unexercised or were forfeited, share price	$ 10.00
Number of options, Options granted	656,000	0
Granted option share purchase price, per share	$ 10.79
Stock based current liability	100,000	2,900,000
Stock based long term liability	300,000	300,000
Liability based awards	0	100,000	400,000
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding	3,700,000
Unrecognized compensation expense related to unvested stock options	2,300,000
Tax benefits recognized for stock based compensation	300,000	900,000	300,000
Shares were repurchased to the termination of the Repurchase Program		0
Number of employees		4
Aggregate amount of loan, secured	200,000
Loans granted prior to termination of loan program		$ 0