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Debt Obligations, net - Unsecured Notes Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Nov. 30, 2019	Oct. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 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%
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%
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%
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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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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