Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Comparison Of Basic And Diluted Earnings Per Share

	2011		2010		2009
Basic earnings per share
Net income	$	274,548	$	665,005	$	606,887
Weighted average common shares outstanding		38,093,351		46,491,279		49,503,438
Basic earnings per share	$	7.21	$	14.30	$	12.26

	2011		2010		2009
Diluted earnings per share
Net income	$	274,548	$	665,005	$	606,887
Weighted average common shares outstanding		38,093,351		46,491,279		49,503,438
Share equivalents:
Warrants and options		387,549		1,668,262		1,241,644
Restricted stock units		418,588		669,006		413,714
LTIP awards		767,176		1,084,389		833,878
Employee share repurchase plan		1,241		381		—
Weighted average common shares and common share equivalents outstanding — diluted		39,667,905		49,913,317		51,992,674
Diluted earnings per share	$	6.92	$	13.32	$	11.67