This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907

CONSOLIDATED STATEMENTS OF EQUITY (USD $) In Thousands, unless otherwise specified	Total Stockholders' Equity	Common Stock	Additional Paid-In Capital	Cumulative Dividends In Excess Of Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Total
Balance at Dec. 31, 2013	$ 10,723,300	$ 456,961	$ 11,334,041	$ (1,053,215)	$ (14,487)	$ 207,834	$ 10,931,134
Balance (in shares) at Dec. 31, 2013		456,961
Increase (Decrease) in Stockholders' Equity
Net (loss) income	259,111			259,111		4,512	263,623us-gaap_ProfitLoss
Other comprehensive income (losses)	(83)				(83)		(83)
Issuance of common stock, net	32,706	1,287	31,419			(73)	32,633
Issuance of common stock, net (in shares)		1,287
Repurchase of common stock	(8,068)	(208)	(7,860)				(8,068)
Repurchase of common stock (in shares)		(208)
Exercise of stock options	95	4	91				95
Exercise of stock options (in shares)		4
Amortization of deferred compensation	4,890		4,890				4,890
Common dividends ($0.565 and $0.545 per share for the three months ended March 31, 2015 and 2014, respectively)	(250,198)			(250,198)			(250,198)us-gaap_DividendsCommonStock
Distributions to noncontrolling interests						(3,975)	(3,975)
Issuance of noncontrolling interests						1,193	1,193
Purchase of noncontrolling interests						(1,671)	(1,671)
Balance at Mar. 31, 2014	10,761,753	458,044	11,362,581	(1,044,302)	(14,570)	207,820	10,969,573
Balance (in shares) at Mar. 31, 2014		458,044
Balance at Dec. 31, 2014	10,735,297	459,746	11,431,987	(1,132,541)	(23,895)	261,802	10,997,099
Balance (in shares) at Dec. 31, 2014		459,746
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(240,614)			(240,614)		3,111	(237,503)us-gaap_ProfitLoss
Other comprehensive income (losses)	(4,566)				(4,566)		(4,566)
Issuance of common stock, net	36,812	1,155	35,657			(1,608)	35,204
Issuance of common stock, net (in shares)		1,155
Repurchase of common stock	(6,096)	(128)	(5,968)				(6,096)
Repurchase of common stock (in shares)		(128)
Exercise of stock options	27,221	811	26,410				27,221
Exercise of stock options (in shares)		811
Amortization of deferred compensation	6,165		6,165				6,165
Common dividends ($0.565 and $0.545 per share for the three months ended March 31, 2015 and 2014, respectively)	(260,686)			(260,686)			(260,686)us-gaap_DividendsCommonStock
Distributions to noncontrolling interests	(263)		(263)			(3,861)	(4,124)
Issuance of noncontrolling interests						2,932	2,932
Balance at Mar. 31, 2015	$ 10,293,270	$ 461,584	$ 11,493,988	$ (1,633,841)	$ (28,461)	$ 262,376	$ 10,555,646
Balance (in shares) at Mar. 31, 2015		461,584