Equity and Accumulated Other Comprehensive Loss, Net (Schedule of Dividends) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares
Series C Preferred Stock
Dividends Payable [Line Items]
Dividends, preferred stock	$ 9,999
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.65625
Series C Preferred Stock | March 1, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	$ 3,333
Series C Preferred Stock | May 8, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	3,333
Series C Preferred Stock | August 11, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	3,333
Series G Preferred Stock
Dividends Payable [Line Items]
Dividends, preferred stock	$ 11,016
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.46875
Series G Preferred Stock | March 1, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	$ 3,672
Series G Preferred Stock | May 8, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	3,672
Series G Preferred Stock | August 11, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	3,672
Series H Preferred Stock
Dividends Payable [Line Items]
Dividends, preferred stock	$ 20,190
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.84375
Series H Preferred Stock | March 1, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	$ 6,730
Series H Preferred Stock | May 8, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	6,730
Series H Preferred Stock | August 11, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	6,730
Series I Preferred Stock
Dividends Payable [Line Items]
Dividends, preferred stock	$ 11,907
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.5875
Series I Preferred Stock | March 1, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	$ 3,969
Series I Preferred Stock | May 8, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	3,969
Series I Preferred Stock | August 11, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	3,969
Series J Preferred Stock
Dividends Payable [Line Items]
Dividends, preferred stock	$ 7,875
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.3125
Series J Preferred Stock | March 1, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	$ 2,625
Series J Preferred Stock | May 8, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	2,625
Series J Preferred Stock | August 11, 2018 Installment
Dividends Payable [Line Items]
Dividends, preferred stock	2,625
Common Stock
Dividends Payable [Line Items]
Dividends, common stock	$ 624,252
Common stock dividend per share amount (in dollars per share) | $ / shares	$ 4.04
Common Stock | March 1, 2018 Installment
Dividends Payable [Line Items]
Dividends, common stock	$ 208,015
Common Stock | May 8, 2018 Installment
Dividends Payable [Line Items]
Dividends, common stock	208,071
Common Stock | August 11, 2018 Installment
Dividends Payable [Line Items]
Dividends, common stock	$ 208,166