Earnings Per Common Share (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Common Share
Income available for common stockholders - Basic	$ 40,615	$ 30,036	$ 52,730	$ 48,590
Convertible, redeemable preferred stock				40
Income available for common stockholders - Diluted	$ 40,615	$ 30,036	$ 52,730	$ 48,630
Weighted average common shares outstanding - Basic	38,722	38,830	38,619	38,582
Unvested restricted stock units	79	127	119	135
Stock options	146	179	177	193
Convertible, redeemable preferred stock				205
Weighted average common shares outstanding - Diluted	38,947	39,136	38,915	39,115
Anti-dilutive shares			0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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