Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2015	Mar. 31, 2014
Income from continuing operations		$ 11,840	$ 109
Preferred stock dividends		(3,050)	(3,050)
Income (Loss) from continuing operations attributable to noncontrolling interests		(2,166)	(8)
Income (Loss) from continuing operations attributable to common stockholders		10,956	(2,933)
Inocme (Loss) from discontinued operations		(1,157)	939
Income from discontinued operations attributable to noncontrolling interests		9	(7)
Income (Loss) from discontinued operations attributable to common stockholders		(1,166)	946
Basic earnings per share:
Income (Loss) from continuing operations attributable to common stockholders		10,956	(2,933)
Income (Loss) from discontinued operations attributable to common stockholders		(1,166)	946
Net income (Loss) attributable to common stockholders		$ 9,790	$ (1,987)
Net income attributable to common stockholders		64,720,000	64,495,000
Income (Loss) from continuing operations attributable to common stockholders (in dollars per share)		$ 0.17	$ (0.04)
Income (Loss) from discontinued operations attributable to common stockholders (in dollars per share)		(0.02)	0.01
Income (Loss) attributable to common stockholders (in dollars per share)		$ 0.15	$ (0.03)
Effect of Dilutive Securities
Interest expense on exchangeable debt		$ 1,356
Incremental shares from assumed conversion	[1]	13,966	434
Diluted earnings per share:
Income (Loss) from continuing operations attributable to common stockholders		$ 12,312	$ (2,933)
Income (Loss) from discontinued operations attributable to common stockholders		(1,166)	946
Net income (Loss) attributable to common stockholders		$ 11,146	$ (1,987)
Net income attributable to common stockholders		78,686,000	64,929,000
Income (Loss) from continuing operations attributable to common stockholders (in dollars per share)		$ 0.15	$ (0.04)
Income (LOss) from discontinued operations attributable to common stockholders (in dollars per share)		(0.01)	0.01
Income (Loss) attributable to common stockholders (in dollars per share)		$ 0.14	$ (0.03)

[1] The effect of the inclusion of all potentially dilutive securities for 2015 is dilutive when computing diluted earnings per share. For the period ended March 31, 2015, shares issuable upon settlement of the exchange feature of the Exchangeable Senior Notes were dilutive and were included in the computation of diluted earnings per share based on the “if-converted” method. The computation of diluted earnings per share used net income adjusted for interest expense related to the Exchangeable Senior Notes of $1.4 million and a share price equal to the March 31, 2015 ending share value of $7.16 per share to calculate the incremental shares. For the period ended December 31, 2014, shares issuable upon settlement of the exchange feature of the Exchangeable Senior Notes were anti-dilutive and were not included in the computation of diluted earnings per share based on the “if-converted” method.