Stock Compensation (Details Textual) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended		9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Aug. 31, 2012 Restricted Stock Units (RSUs) [Member]	Apr. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Aug. 31, 2012 Stock Appreciation Rights [Member]	Sep. 30, 2012 Stock Incentive, 2002 to December 2010 [Member]	Sep. 30, 2012 Stock Incentive Plan, 2011, Beginning in June 2011 [Member]
Stock Compensation (Textual) [Abstract]
Share based compensation granted under plan vest period						2 years		4 years	3 years	4 years
Underlying shares vesting on each anniversary of grant									33.00%
Term of Award									10 years
Underlying shares vesting on the first anniversary of the grant										25.00%
Common stock remain available for future grant under the 2011 Plan										1,539,930
Weighted-average fair value per share of stock-based awards, granted to employees	$ 7.09	$ 4.74	$ 6.52	$ 6.54	$ 10.80	$ 5.40
Intrinsic value of stock options exercised			$ 982,000	$ 82,000
Grant date fair value of stock options that vested			3,194,000	2,300,000
Granted, shares					7,500	32,377	39,877	70,000
Exercise price of SARs								$ 10.08
Grant date fair value of SARs								508,000
Unrecognized compensation cost related to nonvested share-based compensation arrangements granted, including stock options and restricted stock	$ 10,305,000		$ 10,305,000
Costs are expected to be recognized over a weighted-average period			3 years 2 months 12 days