Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator for basic and diluted earnings per share:
Income from continuing operations	$ 12,893	$ 86,918	$ 211,898	$ 127,588	$ 63,302	$ 103,281	$ 169,300	$ 80,108	$ 439,297	$ 415,991	$ 1,361,222
Discontinued operations					0	0	0	(10)	0	(10)	(110)
Net income	12,893	86,918	211,898	127,588	63,302	103,281	169,300	80,098	439,297	415,981	1,361,112
Net income attributable to noncontrolling interests	1,450	1,659	1,369	1,803	1,029	1,309	2,781	1,395	6,281	6,514	4,642
Net income attributable to common stockholders	$ 11,443	$ 85,259	$ 210,529	$ 125,785	$ 62,273	$ 101,972	$ 166,519	$ 78,703	$ 433,016	$ 409,467	$ 1,356,470
Denominator for basic earnings per share—weighted average shares
Denominator for basic earnings per share - weighted average shares (in shares)									365,977	356,265	355,326
Stock options									391	174	494
Restricted stock awards									527	331	265
OP unitholder interests									2,991	2,531	2,481
Denominator for diluted earnings per share - adjusted weighted average shares (in shares)									369,886	359,301	358,566
Basic earnings per share:
Income from continuing operations (USD per share)	$ 0.03	$ 0.23	$ 0.59	$ 0.36	$ 0.18	$ 0.29	$ 0.48	$ 0.22	$ 1.20	$ 1.17	$ 3.83
Net income attributable to common stockholders (USD per share)	0.03	0.23	0.58	0.35	0.17	0.29	0.47	0.22	1.18	1.15	3.82
Diluted earnings per share:
Income from continuing operations (USD per share)	0.03	0.23	0.58	0.35	0.18	0.29	0.47	0.22	1.19	1.16	3.80
Net income attributable to common stockholders (USD per share)	$ 0.03	$ 0.23	$ 0.58	$ 0.35	$ 0.17	$ 0.28	$ 0.46	$ 0.22	$ 1.17	$ 1.14	$ 3.78
Anti-dilutive options outstanding (in shares)									1,100	3,500	3,000