Equity and Accumulated Other Comprehensive Loss, Net (Redeemable Preferred Stock) (Details) $ / shares in Units, $ in Thousands								12 Months Ended
	Oct. 10, 2019 shares	Mar. 13, 2019 shares	Sep. 14, 2017 $ / shares shares	Aug. 07, 2017 $ / shares shares	Aug. 24, 2015 $ / shares shares	Mar. 26, 2014 $ / shares shares	Apr. 09, 2013 $ / shares shares	Dec. 31, 2019 USD ($) item $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Apr. 01, 2019 $ / shares	Apr. 15, 2017 $ / shares
Class of Stock [Line Items]
Liquidation preference | $								$ 1,456,250
Preferred stock, issued (shares) | shares								58,250,000	50,650,000
Net proceeds from preferred stock | $								$ 1,434,420	$ 1,249,560
Number of quarters with no dividends triggering voting rights | item								6
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares								$ 25.00	$ 25.00
Preferred Stock, Redemption Price Per Share | $ / shares								$ 25.00
Series C Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares			0.6389035
Liquidation preference | $								$ 201,250
Preferred stock dividend per share amount (in dollars per share) | $ / shares			$ 1.65625					$ 1.65625
Preferred stock, issued (shares) | shares								8,050,000	8,050,000
Net proceeds from preferred stock | $								$ 219,250	$ 219,250
Dividend rate percentage			6.625%
Potentially dilutive Series G Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares							0.7532000
Liquidation preference | $								$ 250,000
Preferred stock dividend per share amount (in dollars per share) | $ / shares							$ 1.46875	$ 1.46875
Preferred stock, issued (shares) | shares								10,000,000	10,000,000
Net proceeds from preferred stock | $								$ 241,468	$ 241,468
Dividend rate percentage							5.875%
Potentially dilutive Series H Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares						0.9632000
Preferred stock dividend per share amount (in dollars per share) | $ / shares						$ 1.84375		$ 1.84375
Preferred stock, issued (shares) | shares									14,600,000
Net proceeds from preferred stock | $									$ 353,290
Dividend rate percentage						7.375%
Preferred Stock, Redemption Price Per Share | $ / shares										$ 25.00
Potentially dilutive Series I Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares					0.7623100
Liquidation preference | $								$ 250,000
Preferred stock dividend per share amount (in dollars per share) | $ / shares					$ 1.58750			$ 1.58750
Preferred stock, issued (shares) | shares								10,000,000	10,000,000
Net proceeds from preferred stock | $								$ 242,012	$ 242,012
Dividend rate percentage					6.35%
Series J Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares				0.4252100
Liquidation preference | $								$ 200,000
Preferred stock dividend per share amount (in dollars per share) | $ / shares				$ 1.31250				$ 1.31250
Preferred stock, issued (shares) | shares								8,000,000	8,000,000
Net proceeds from preferred stock | $								$ 193,540	$ 193,540
Dividend rate percentage				5.25%
Potentially dilutive Series K Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares		0.4361100
Liquidation preference | $								$ 210,000
Preferred stock dividend per share amount (in dollars per share) | $ / shares								$ 1.46250
Preferred stock, issued (shares) | shares								8,400,000
Net proceeds from preferred stock | $								$ 203,264
Dividend rate percentage		5.85%
Series L Preferred Stock
Class of Stock [Line Items]
Share cap (in shares) | shares	0.3851800
Liquidation preference | $								$ 345,000
Preferred stock dividend per share amount (in dollars per share) | $ / shares								$ 1.30000
Preferred stock, issued (shares) | shares								13,800,000
Net proceeds from preferred stock | $								$ 334,886
Dividend rate percentage	5.20%
Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend per share amount (in dollars per share) | $ / shares								$ 1.65625
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares											$ 25.00
Preferred Stock, Redemption Price Per Share | $ / shares											$ 25.01840