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Debt Obligations, net - Unsecured Notes Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 0	$ 911,000	$ 468,000	$ 3,447,000
Unsecured notes | 4.75% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 675,000,000.0		$ 675,000,000.0
Stated interest rates (as a percent)	4.75%		4.75%
Unsecured notes | 4.625% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000.0		$ 400,000,000.0
Stated interest rates (as a percent)	4.625%		4.625%		4.625%
Unsecured notes | 5.00% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)					5.00%
Loss on early extinguishment of debt			$ 500,000
Unsecured notes | 6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 275,000,000.0		$ 275,000,000.0
Stated interest rates (as a percent)	6.50%		6.50%		6.50%

X

- Definition

Face (par) amount of debt instrument at time of issuance.

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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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