Equity and Accumulated Other Comprehensive Loss, Net (Schedule of Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Sep. 15, 2016	Mar. 26, 2014	Jun. 28, 2013	Apr. 09, 2013	Apr. 18, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Aug. 24, 2015
Series E Preferred Stock and Unit
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 10,062	$ 20,124	$ 20,124
Annual rate of dividend per share (in dollars per share)						$ 1.75
Preferred stock, redemption price per share (in dollars per share)	$ 25.35972
Preferred stock, liquidation preference per share/unit (in dollars per share)	$ 25.00					$ 25	$ 25
Accrued and unpaid dividends up to but not including the redemption date	$ 4,100
Redemption premium	$ 10,300					$ 10,300
Series E Preferred Stock and Unit | February 11, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								5,031
Series E Preferred Stock and Unit | April 29, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								5,031
Series E Preferred Stock and Unit | July 21, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								5,031
Series E Preferred Stock and Unit | November 4, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								5,031
Series E Preferred Stock and Unit | February 25, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							$ 5,031
Series E Preferred Stock and Unit | May 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							5,031
Series E Preferred Stock and Unit | August 11, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							5,031
Series E Preferred Stock and Unit | November 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							5,031
Series E Preferred Stock and Unit | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						5,031
Series E Preferred Stock and Unit | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						5,031
Series E Preferred Stock and Unit | August 10, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						0
Series E Preferred Stock and Unit | November 9, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						0
Series F Preferred Stock and Unit
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 12,092	$ 12,092	12,092
Annual rate of dividend per share (in dollars per share)					$ 1.65625	$ 1.65625
Shares issued upon conversion (in shares)						0.6843
Preferred stock, redemption price per share (in dollars per share)						$ 25.00
Preferred stock, liquidation preference per share/unit (in dollars per share)					$ 25.00	$ 25	$ 25
Series F Preferred Stock and Unit | February 11, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,023
Series F Preferred Stock and Unit | April 29, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,023
Series F Preferred Stock and Unit | July 21, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,023
Series F Preferred Stock and Unit | November 4, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,023
Series F Preferred Stock and Unit | February 25, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							$ 3,023
Series F Preferred Stock and Unit | May 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							3,023
Series F Preferred Stock and Unit | August 11, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							3,023
Series F Preferred Stock and Unit | November 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							3,023
Series F Preferred Stock and Unit | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 3,023
Series F Preferred Stock and Unit | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,023
Series F Preferred Stock and Unit | August 10, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,023
Series F Preferred Stock and Unit | November 9, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,023
Series G Preferred Stock and Unit
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 14,688	$ 14,688	14,688
Annual rate of dividend per share (in dollars per share)			$ 0.334550	$ 1.46875		$ 1.46875
Shares issued upon conversion (in shares)						0.7532
Preferred stock, redemption price per share (in dollars per share)						$ 25.00
Preferred stock, liquidation preference per share/unit (in dollars per share)				$ 25		$ 25	$ 25
Series G Preferred Stock and Unit | February 11, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,672
Series G Preferred Stock and Unit | April 29, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,672
Series G Preferred Stock and Unit | July 21, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,672
Series G Preferred Stock and Unit | November 4, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								3,672
Series G Preferred Stock and Unit | February 25, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							$ 3,672
Series G Preferred Stock and Unit | May 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							3,672
Series G Preferred Stock and Unit | August 11, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							3,672
Series G Preferred Stock and Unit | November 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							3,672
Series G Preferred Stock and Unit | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 3,672
Series G Preferred Stock and Unit | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,672
Series G Preferred Stock and Unit | August 10, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,672
Series G Preferred Stock and Unit | November 9, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,672
Series H Preferred Stock and Unit
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 26,920	$ 26,920	20,564
Annual rate of dividend per share (in dollars per share)		$ 1.84375				$ 1.84375
Shares issued upon conversion (in shares)						0.9632
Preferred stock, redemption price per share (in dollars per share)						$ 25.00
Preferred stock, liquidation preference per share/unit (in dollars per share)		$ 25				$ 25	$ 25
Series H Preferred Stock and Unit | February 11, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								0
Series H Preferred Stock and Unit | April 29, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								7,104
Series H Preferred Stock and Unit | July 21, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								6,730
Series H Preferred Stock and Unit | November 4, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								6,730
Series H Preferred Stock and Unit | February 25, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							$ 6,730
Series H Preferred Stock and Unit | May 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							6,730
Series H Preferred Stock and Unit | August 11, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							6,730
Series H Preferred Stock and Unit | November 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							6,730
Series H Preferred Stock and Unit | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 6,730
Series H Preferred Stock and Unit | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						6,730
Series H Preferred Stock and Unit | August 10, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						6,730
Series H Preferred Stock and Unit | November 9, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						6,730
Series I Preferred Stock and Unit
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 15,876	$ 5,600	0
Annual rate of dividend per share (in dollars per share)						$ 1.588
Shares issued upon conversion (in shares)						0.76231
Preferred stock, redemption price per share (in dollars per share)						$ 25.00
Preferred stock, liquidation preference per share/unit (in dollars per share)						$ 25	$ 25		$ 25.00
Series I Preferred Stock and Unit | February 11, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								0
Series I Preferred Stock and Unit | April 29, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								0
Series I Preferred Stock and Unit | July 21, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								0
Series I Preferred Stock and Unit | November 4, 2014
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units								0
Series I Preferred Stock and Unit | February 25, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							$ 0
Series I Preferred Stock and Unit | May 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							0
Series I Preferred Stock and Unit | August 11, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							0
Series I Preferred Stock and Unit | November 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units							5,600
Series I Preferred Stock and Unit | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						$ 3,969
Series I Preferred Stock and Unit | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,969
Series I Preferred Stock and Unit | August 10, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,969
Series I Preferred Stock and Unit | November 9, 2016
Dividends Payable [Line Items]
Dividends/Distributions, preferred stock/units						3,969
Common Stock
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units						536,733	470,748	$ 444,103
Common stock dividend per share amount (in dollars per share)								$ 3.320
Common Stock | February 11, 2014
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units								$ 106,743
Common Stock | April 29, 2014
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units								112,357
Common Stock | July 21, 2014
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units								112,465
Common Stock | November 4, 2014
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units								$ 112,538
Common Stock | February 25, 2015
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units							115,419
Common Stock | May 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units							115,458
Common Stock | August 11, 2015
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units							115,454
Common Stock | November 12, 2015
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units							$ 124,417
Common stock dividend per share amount (in dollars per share)							$ 3.400
Common Stock | February 17, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units						131,587
Common Stock | May 11, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units						131,607
Common Stock | August 10, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units						131,657
Common Stock | November 9, 2016
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units						$ 141,882
Common stock dividend per share amount (in dollars per share)						$ 3.52