Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,030,306	$ 452,736
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt, gross	21,543	119,064
Fair value adjustments	$ (497)	860
Senior Unsecured Notes \| 7.375% Senior Notes, Due 2019
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	7.375%
Long-term debt, gross	$ 0	97,521
Senior Unsecured Notes \| 6.375% Senior Notes, Due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	6.375%
Long-term debt, gross	$ 21,543	21,543
Other Secured Borrowings \| 8.375% Senior Secured Notes Due In 2022
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	8.375%
Long-term debt, gross	$ 291,509	330,878
Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	313,052	449,942
Unamortized debt issuance costs	(1,470)	(2,075)
Senior notes	$ 311,085	$ 448,727

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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