Income per Share (Tables)

6 Months Ended

Jun. 30, 2011

Income per Share

Summary of Basic and Diluted Earnings per Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Net income available to common stockholders	$	31,990	$	9,091	$	62,970	$	23,835
Weighted average shares outstanding—basic		96,295,585		80,542,329		93,875,415		79,164,167
Potentially dilutive common shares:
Stock options		203,078		225,931		193,985		206,803
Class C Units (2007 Grant)		73,855		154,229		67,856		142,747
Unvested incentive units		180,377		179,267		152,927		155,504
Excess exchange value of the 2026 Debentures		758,916		1,920,061		722,782		1,781,415
Weighted average shares outstanding—diluted		97,511,811		83,021,817		95,012,965		81,450,636
Income per share:
Basic	$	0.33	$	0.11	$	0.67	$	0.30
Diluted	$	0.33	$	0.11	$	0.66	$	0.29

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Weighted average of Operating Partnership common units not owned by us		4,760,802		4,964,417		4,823,553		4,874,406
Potentially dilutive outstanding stock options		—		—		—		5,346
Potentially dilutive 2029 Debentures		6,289,434		6,195,345		6,279,766		6,195,345
Potentially dilutive Series C Cumulative Convertible Preferred Stock		2,864,660		3,657,477		3,256,316		3,657,477
Potentially dilutive Series D Cumulative Convertible Preferred Stock		6,418,585		8,237,540		7,370,713		8,226,381
		20,333,481		23,054,779		21,730,348		22,958,955