Net Income Available to Common Stockholders Per Share of the Company (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended																		12 Months Ended
		Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	[1]	Sep. 30, 2014	[1]	Jun. 30, 2014		Mar. 31, 2014	[1]	Dec. 31, 2012		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Numerator:
Income from continuing operations		$ 29,308		$ 106,704		$ 58,590		$ 44,002		$ 19,417		$ 13,168		$ 15,854		$ 10,874		$ 14,935		$ 238,604		$ 59,313		$ 14,935
Income from continuing operations attributable to noncontrolling interests																		(36)		(4,523)		(966)
Preferred dividends and distributions		$ (3,312)		$ (3,313)		$ (3,312)		$ (3,313)		(3,312)		(3,313)		(3,312)	[1]	(3,313)		(13,250)		(13,250)		(13,250)
Allocation to participating securities (1)	[2]																	(1,689)		(1,634)		(1,699)
Numerator for basic and diluted income (loss) from continuing operations available to common stockholders																		(40)		219,197		43,398
Income from discontinued operations (2)										$ 12,013		$ 6,135		$ 15,289	[1]	$ 91,058		29,630	[3]	0	[3]	124,495	[3]	$ 29,630	[4]
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership (2)																		(649)		0		(2,623)
Numerator for basic and diluted net income available to common stockholders																		$ 28,941		$ 219,197		$ 165,270
Denominator:
Basic weighted average vested shares outstanding																		77,343,853		89,854,096		83,090,235		77,343,853
Effect of dilutive securities – contingently issuable shares and stock options																		0		541,679		1,877,485
Diluted weighted average vested shares and common stock equivalents outstanding																		77,343,853		90,395,775		84,967,720		77,343,853
Basic earnings per share:
Income (loss) from continuing operations available to common stockholders per share (dollars per share)																				$ 2.44		$ 0.52		$ 0.00
Income from discontinued operations per share of common stock (dollars per share)																		$ 0.37	[3]	0.00	[4]	1.47	[3]
Net income available to common stockholders per share (dollars per share)		$ 0.27		$ 1.10		$ 0.61		$ 0.45		$ 0.32		$ 0.18		$ 0.33	[1]	$ 1.17		0.37		2.44		1.99		0.37
Diluted earnings per share:
Income (loss) from continuing operations available to common stockholders per share (dollars per share)																				2.42		0.51		0.00
Income from discontinued operations per share of common stock (dollars per share)																		0.37	[4]	0.00	[4]	1.44	[3]
Net income available to common stockholders per share (dollars per share)		$ 0.27		$ 1.09		$ 0.61		$ 0.45		$ 0.32		$ 0.18		$ 0.32	[1]	$ 1.14		$ 0.37		$ 2.42		$ 1.95		$ 0.37

[1] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the Company's public offerings of common stock and its at-the-market stock offering programs that occurred during the years ended December 31, 2015 and 2014.

[2] Participating securities include nonvested shares, certain time-based RSUs and vested market measure-based RSUs.

[3] (2)The Company adopted ASU 2014-08 effective January 1, 2015 (see Note 2 “Basis of Presentation and Significant Accounting Policies” for additional information). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.

[4] The Operating Partnership adopted ASU 2014-08 effective January 1, 2015 (see Note 2 “Basis of Presentation and Significant Accounting Policies” for additional information). As a result, properties classified as held for sale and/or disposed of subsequent to January 1, 2015 that do not represent a strategic shift are no longer presented as discontinued operations.