Earnings Per Share (Schedule of calculation of numerator and denominator in earnings per share) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 2,989,000	$ (16,620,000)
Preferred stock dividends	(2,688,000)	(2,799,000)
Preferred stock redemptions costs		(3,507,000)
Net (income) loss attributable to noncontrolling interests	(107,000)	(48,000)
Net earnings allocated to unvested shares	(144,000)	(217,000)
Net income (loss) attributable to vested common shares	$ 50,000	$ (23,191,000)
Weighted average number of vested common shares outstanding, basic and diluted	86,580,000	87,623,000
Net income (loss) per common share attributable to common shareholders, basic and diluted	$ 0.00	$ (0.26)