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Debt Obligations, net - Unsecured Notes Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Nov. 30, 2019	Oct. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 0	$ 0	$ 4,115,000	$ 468,000
Unsecured notes
Debt Instrument [Line Items]
Loss on early extinguishment of debt					$ 4,100,000
Unsecured notes | 4.75% Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 100,000,000.0		$ 675,000,000.0
Stated interest rates (as a percent)			4.75%		4.75%		4.75%		4.75%
Percentage of par							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 rates (as a percent)								4.625%
Unsecured notes | 6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount								$ 275,000,000.0
Stated interest rates (as a percent)								6.50%
Unsecured notes | 4.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 550,000,000.0
Stated interest rates (as a percent)		4.25%	4.25%		4.25%
Principal amount redeemed		$ 375,000,000.0
Unsecured notes | 6.00% Senior Notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)		6.00%	6.00%		6.00%
Principal amount redeemed	$ 110,500,000

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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