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Debt Obligations, net (Schedule of Debt) (Details) - USD ($)	3 Months Ended		6 Months Ended		7 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Apr. 12, 2017	Aug. 31, 2016
Debt Instrument [Line Items]
Total debt obligations	$ 3,394,374,000		$ 3,394,374,000		$ 3,418,357,000
Debt discounts and deferred financing costs, net	(26,261,000)		(26,261,000)		(28,449,000)
Total debt obligations, net	3,368,113,000		3,368,113,000		3,389,908,000
Interest costs capitalized	2,000,000	$ 1,400,000	4,000,000	$ 2,800,000
2015 $250 Million Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount	250,000,000		250,000,000
Total debt obligations	0		$ 0		0
Converted term loan, term			1 year
2015 $250 Million Secured Revolving Credit Facility | Minimum | Interest Rate Category One
Debt Instrument [Line Items]
Debt instrument, margin (as a percent)			1.25%
2015 $250 Million Secured Revolving Credit Facility | Minimum | Interest Rate Category Two
Debt Instrument [Line Items]
Debt instrument, margin (as a percent)			2.25%
2015 $250 Million Secured Revolving Credit Facility | Maximum | Interest Rate Category One
Debt Instrument [Line Items]
Debt instrument, margin (as a percent)			1.75%
2015 $250 Million Secured Revolving Credit Facility | Maximum | Interest Rate Category Two
Debt Instrument [Line Items]
Debt instrument, margin (as a percent)			2.75%
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			2.75%
2015 $250 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			1.00%
2015 $250 Million Secured Revolving Credit Facility | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			0.50%
2016 Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount					450,000,000.0		$ 500,000,000.0
Total debt obligations	498,750,000		$ 498,750,000		$ 498,648,000
Basis point spread on variable interest rate (as a percent)			1.00%
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			3.75%		4.50%
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			1.00%		1.00%
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			2.75%
2016 Senior Secured Credit Facility | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			0.50%
Mortgages collateralized by net lease assets
Debt Instrument [Line Items]
Total debt obligations	$ 225,624,000		$ 225,624,000		$ 249,987,000
Weighted average interest rate (as a percent)	5.20%		5.20%
Mortgages collateralized by net lease assets | Minimum
Debt Instrument [Line Items]
Stated interest rates (as a percent)	3.875%		3.875%
Mortgages collateralized by net lease assets | Maximum
Debt Instrument [Line Items]
Stated interest rates (as a percent)	7.26%		7.26%
Mortgages collateralized by net lease assets | London Interbank Offered Rate (LIBOR) | Property One
Debt Instrument [Line Items]
Basis point spread on variable interest rate (as a percent)			2.00%
Total secured credit facilities and mortgages
Debt Instrument [Line Items]
Total debt obligations	$ 724,374,000		$ 724,374,000		748,635,000
5.85% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 0		$ 0		99,722,000
Stated interest rates (as a percent)	5.85%		5.85%
9.00% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 0		$ 0		275,000,000
Stated interest rates (as a percent)	9.00%		9.00%			9.00%
4.00% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 550,000,000		$ 550,000,000		550,000,000
Stated interest rates (as a percent)	4.00%		4.00%
7.125% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 300,000,000		$ 300,000,000		300,000,000
Stated interest rates (as a percent)	7.125%		7.125%
4.875% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 300,000,000		$ 300,000,000		300,000,000
Stated interest rates (as a percent)	4.875%		4.875%
5.00% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 770,000,000		$ 770,000,000		770,000,000
Stated interest rates (as a percent)	5.00%		5.00%
6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 275,000,000		$ 275,000,000
Total debt obligations	$ 275,000,000		$ 275,000,000		275,000,000
Stated interest rates (as a percent)	6.50%	6.50%	6.50%	6.50%
6.00% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 375,000,000.0		$ 375,000,000.0
Total debt obligations	$ 375,000,000		$ 375,000,000		0
Stated interest rates (as a percent)	6.00%		6.00%
Unsecured Notes
Debt Instrument [Line Items]
Total debt obligations	$ 2,570,000,000		$ 2,570,000,000		2,569,722,000
Trust preferred securities
Debt Instrument [Line Items]
Total debt obligations	$ 100,000,000		$ 100,000,000		$ 100,000,000
Basis point spread on variable interest rate (as a percent)			1.50%

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