Equity and Accumulated Other Comprehensive Loss, Net (6.350% Series I Cumulative Redeemable Preferred Stock Narrative) (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Dec. 31, 2015 $ / shares	Aug. 24, 2015 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) quarter $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($)
Class of Stock [Line Items]
Gross proceeds from the issuance of preferred stock | $			$ 0	$ 250,000	$ 365,000
Series I Preferred Stock and Unit
Class of Stock [Line Items]
New issues of stock during period (in shares/units) | shares		10,000,000
Preferred stock, dividend rate		6.35%	6.35%	6.35%
Gross proceeds from the issuance of preferred stock | $		$ 242,000
Preferred stock dividends per share declared (in dollars per share)	$ 0.56003	$ 1.5875
Preferred stock, liquidation preference per share/unit (in dollars per share)	$ 25	$ 25.00	$ 25	$ 25
Preferred stock, redemption price per share (in dollars per share)			$ 25.00
Number of quarters with no dividends triggering voting rights | quarter			6
Shares issued upon conversion (in shares) | shares			0.76231