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Debt Obligations, net (Narrative) (Details) - USD ($)	1 Months Ended				12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2020	Nov. 30, 2019
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net					$ 12,038,000	$ 27,724,000	$ 10,367,000
2016 Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate					1.00%
Secured Debt | 2016 Senior Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount				$ 650,000,000.0
Secured Debt | 2016 Senior Term Loan | Gain (Loss) On Extinguishment Of Debt
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net							2,500,000
Secured Debt | 2016 Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate				2.75%	2.75%
Secured Debt | 2016 Senior Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate					1.75%
Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 350,000,000.0
Secured Debt | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage			0.25%
Current borrowing capacity					$ 350,000,000.0
Secured Debt | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage			0.45%
Secured Debt | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate					2.00%
Secured Debt | Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate			2.00%		1.00%
Secured Debt | Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate			2.50%
Secured Debt | Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate			1.00%
Secured Debt | Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate			1.50%
Unsecured Notes
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net					$ 12,000,000.0	26,600,000	$ 1,200,000
Unsecured Notes | 4.75% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 675,000,000.0						$ 100,000,000.0
Stated interest rate			4.75%		4.75%				4.75%
Percentage of par credit facilities were issued at									102.00%
Yield to maturity									4.29%
Unsecured Notes | 4.625% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 400,000,000.0
Stated interest rate			4.625%
Unsecured Notes | 6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 275,000,000.0
Stated interest rate			6.50%
Unsecured Notes | 4.25% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 550,000,000.0				$ 550,000,000.0
Stated interest rate		4.25%			4.25%	4.25%
Unsecured Notes | 6.00% senior notes
Debt Instrument [Line Items]
Stated interest rate		6.00%			6.00%	6.00%
Principal amount called for redemption	$ 110,500,000	$ 375,000,000.0
Unsecured Notes | 5.5% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount								$ 400,000,000.0
Stated interest rate								5.50%
Unsecured Notes | 5.25% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount								$ 400,000,000.0
Stated interest rate					5.25%			5.25%

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