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Debt Obligations, net (Schedule of Debt) (Details) - USD ($)	3 Months Ended		7 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Aug. 31, 2016
Debt Instrument [Line Items]
Total debt obligations	$ 3,919,535,000		$ 3,418,357,000
Debt discounts and deferred financing costs, net	(37,140,000)		(28,449,000)
Total debt obligations, net	3,882,395,000		3,389,908,000
Interest costs capitalized	2,000,000	$ 1,400,000
2015 $250 Million Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount	250,000,000
Total debt obligations	$ 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	$ 500,000,000		$ 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%
2017 Secured Financing
Debt Instrument [Line Items]
Debt instrument, face amount	$ 227,000,000
Total debt obligations	$ 227,000,000		$ 0
Stated interest rates (as a percent)	3.795%
Effective interest rate (as a percent)	3.773%
Mortgages collateralized by net lease assets
Debt Instrument [Line Items]
Total debt obligations	$ 247,535,000		249,987,000
Stated interest rate, minimum (as a percent)	3.875%
Stated interest rate, maximum (as a percent)	7.26%
Weighted average interest rate (as a percent)	5.10%
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	$ 974,535,000		748,635,000
5.85% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 0		99,722,000
Stated interest rates (as a percent)	5.85%
9.00% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 275,000,000		275,000,000
Stated interest rates (as a percent)	9.00%
4.00% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 550,000,000		550,000,000
Stated interest rates (as a percent)	4.00%
7.125% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 300,000,000		300,000,000
Stated interest rates (as a percent)	7.125%
4.875% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 300,000,000		300,000,000
Stated interest rates (as a percent)	4.875%
5.00% senior notes
Debt Instrument [Line Items]
Total debt obligations	$ 770,000,000		770,000,000
Stated interest rates (as a percent)	5.00%
6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 275,000,000
Total debt obligations	$ 275,000,000		275,000,000
Stated interest rates (as a percent)	6.50%	6.50%
6.00% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 375,000,000.0
Total debt obligations	$ 375,000,000		0
Stated interest rates (as a percent)	6.00%
Unsecured Notes
Debt Instrument [Line Items]
Total debt obligations	$ 2,845,000,000		2,569,722,000
Trust preferred securities
Debt Instrument [Line Items]
Total debt obligations	$ 100,000,000		$ 100,000,000
Basis point spread on variable interest rate (as a percent)	1.50%
Interest rate swaps | 2017 Secured Financing
Debt Instrument [Line Items]
Notional amount	$ 200,000,000

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