Treasury Stock and Share Based Awards (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Treasury stock
Balance at December 31, 2010, Shares	3,359,859
Balance at December 31, 2010	$ 44,725,000
Common stock repurchased, Shares, as a result of restricted stock forfeitures	853
Restricted stock withholdings, Shares	25,200
Restricted stock withholdings, Cost	494,000
Restricted stock awards cancelled, Number of Treasury Shares	4,613
Balance at June 30, 2011, Shares	3,390,525
Balance at June 30, 2011	45,219,000
Stock Options
Number of Options Outstanding Beginning Balance	140,356
Weighted Average Exercise Price Beginning Balance	$ 7.63
Weighted Average Grant Date Fair Value Beginning Balance		3.51
Number of Options Exercised	(58,190)
Weighted Average Exercise Price Exercised	$ 7.63
Weighted Average Grant Date Fair Value of Options Exercised During Period	$ 3.51
Number of Options Outstanding Ending Balance	82,166
Weighted Average Exercise Price Ending Balance	$ 7.63
Weighted Average Exercise Price Ending Balance	$ 3.51
Aggregate Intrinsic Value	1,075,000
Number of Options Exercisable at June 30, 2011	82,166
Weighted Average Exercise Price Exercisable at June 30, 2011	$ 7.63
Weighted Average Grant Date Fair Value Exercisable Number of Options Exercisable at June 30, 2011	3.51
Aggregate Intrinsic Value Exercisable Number of Options Exercisable at June 30, 2011	1,075,000
Restricted stock
Shares of Restricted Stock Outstanding, Beginning	1,254,691
Weighted Average Grant Date Fair Value Outstanding, Beginning	$ 14.60
Shares of Restricted Stock Granted	424,436
Weighted Average Grant Date Fair Value Granted	$ 19.45
Shares of Restricted Stock Forfeited	(853)
Weighted Average Grant Date Fair Value Forfeited	$ 12.89
Shares of Restricted Stock Forfeited	(288,204)
Weighted Average Grant Date Fair Value Vested	$ 10.84
Shares of Restricted Stock Cancelled	(4,613)
Weighted Average Grant Date Fair Value Cancelled	$ 18.35
Shares of Restricted Stock Outstanding, Ending	1,385,457
Weighted Average Grant Date Fair Value Outstanding, Ending	$ 16.85
Unvested restricted stock, Ending	1,385,457
Weighted Average Grant Date Fair Value Unvested Restricted Stock, Ending	$ 3.51
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%	51,239
Fair value of shares vesting at an IRR level of at least 8.5%	991,000
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%	102,488
Fair value of shares vesting at an IRR level of at least 10.5%	1,983,000
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%	153,727
Fair value of shares vesting at an IRR level of at least 12.5%	$ 2,975,000