Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Senior notes	$ 310,788	$ 448,727
Unamortized debt issuance costs	(1,100)
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior notes	21,543	119,064
Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes	313,052	449,942
Unamortized debt issuance costs	(1,694)	(2,075)
Fair value adjustments	(570)	860
Long-term debt	310,788	448,727
7.375% Senior Notes, Due 2019 [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior notes	$ 0	97,521
Interest rate	7.375%
6.375% Senior Notes, Due 2021 [Member] \| Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior notes	$ 21,543	21,543
Interest rate	6.375%
8.375% Senior Secured Notes Due In 2022 [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Senior notes	$ 291,509	$ 330,878
Interest rate	8.375%

Contractual interest rate for funds borrowed, under the debt agreement.

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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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