Treasury Stock and Share Based Awards (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Treasury stock
Beginning Balance, Shares	3,391,592
Beginning Balance	$ 45,219
Restricted stock withholdings, Shares	122,043
Restricted stock withholdings, Cost	2,700
Ending Balance, Shares	3,513,635
Ending Balance	47,919
Stock Options
Number of Options Outstanding Beginning Balance	82,166
Weighted Average Exercise Price Beginning Balance	$ 7.63
Number of Options Exercised	(200)
Weighted Average Exercise Price Exercised	$ 7.63
Number of Options Outstanding Ending Balance	81,966
Weighted Average Exercise Price Ending Balance	$ 7.63
Aggregate Intrinsic Value	1,174
Number of Options Exercisable at March 31, 2012	81,966
Weighted Average Exercise Price Exercisable at March 31, 2012	$ 7.63
Aggregate intrinsic value exercisable number of options exercisable at March 31, 2012	1,174
Restricted stock
Shares of Restricted Stock Outstanding, Beginning	1,384,390
Weighted Average Grant Date Fair Value Outstanding, Beginning	$ 16.85
Shares of Restricted Stock Granted	618,230
Weighted Average Grant Date Fair Value Granted	$ 21.63
Shares of Restricted Stock Vested	(347,091)
Weighted Average Grant Date Fair Value Vested	$ 17.75
Shares of Restricted Stock Outstanding, Ending	1,655,529
Weighted Average Grant Date Fair Value Outstanding, Ending	$ 18.45
Unvested restricted stock, Ending	1,655,529
Weighted Average Grant Date Fair Value Outstanding Unvested restricted stock, Ending	$ 18.45
at IRR of at least 8.5% [Member]
Number of shares vest under restricted stock unit awards
Number of shares vesting at an IRR level of at least 8.5%	50,981
Fair value of shares vesting at an IRR level of at least 8.5%	1,106
at IRR of at least 10.5% [Member]
Number of shares vest under restricted stock unit awards
Number of shares vesting at an IRR level of at least 10.5%	101,974
Fair value of shares vesting at an IRR level of at least 10.5%	2,206
at IRR of at least 12.5% [Member]
Number of shares vest under restricted stock unit awards
Number of shares vesting at an IRR level of at least 12.5%	152,955
Fair value of shares vesting at an IRR level of at least 12.5%	$ 3,308