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Debt Obligations, Senior Unsecured Notes (Details) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2019	Mar. 31, 2019	May 31, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Debt Obligations
Senior notes carrying value					$ 319,799	$ 122,484
Senior Unsecured Notes
Debt Obligations
Principal amount					325,000	$ 125,000
6.50% Convertible Notes
Debt Obligations
Interest rate (as a percent)						6.50%
5.625% Notes
Debt Obligations
Principal amount				$ 100,000	125,000
Interest rate (as a percent)				5.625%
Proceeds from issued debt			$ 25,000	$ 122,300
Redemption of aggregate principal amount (as a percent)				100.00%
Senior notes carrying value					123,100	$ 122,500
Deferred financing fees					$ 1,900	$ 2,500
Weighted average note rate including certain fees and costs (as a percent)					6.08%	6.08%
5.75% Notes
Debt Obligations
Principal amount		$ 90,000
Interest rate (as a percent)		5.75%
Proceeds from issued debt		$ 88,200
Redemption of aggregate principal amount (as a percent)		100.00%
Senior notes carrying value					$ 88,400
Deferred financing fees					$ 1,600
Weighted average note rate including certain fees and costs (as a percent)					6.18%
7.375% Convertible Notes
Debt Obligations
Interest rate (as a percent)				7.375%
Debt instrument redemption value				$ 97,900
4.75% Notes
Debt Obligations
Principal amount	$ 110,000
Interest rate (as a percent)	4.75%
Proceeds from issued debt	$ 108,200
Redemption of aggregate principal amount (as a percent)	100.00%
Senior notes carrying value					$ 108,400
Deferred financing fees					$ 1,600
Weighted average note rate including certain fees and costs (as a percent)					5.23%

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Represents the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding, including certain fees and costs.

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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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