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Borrowings - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 09, 2019	Sep. 30, 2018	Jun. 15, 2006
Debt Instrument [Line Items]
Total debt (net of premium and debt issuance costs)	$ 1,178,309		$ 1,231,254
Unamortized debt premium, net	0		2,640
Senior Notes
Debt Instrument [Line Items]
Senior Unsecured Term Loan (Term Loan)		$ 150,000	0
Total debt (net of premium and debt issuance costs)	1,111,085		1,163,138
Unamortized debt premium, net	0		2,640
Unamortized debt issuance costs	$ (12,470)		(14,336)
Senior Notes \| 8 3/4% Senior Notes Maturing March 2022
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	8.75%
Total debt (net of premium and debt issuance costs)	$ 0		500,000
Senior Notes \| 7 1/4% Senior Notes Maturing February 2023
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	7.25%
Total debt (net of premium and debt issuance costs)	$ 0		24,834
Senior Notes \| 6 3/4% Senior Notes Maturing March of 2025
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	6.75%
Total debt (net of premium and debt issuance costs)	$ 229,555		250,000
Senior Notes \| 5 7/8% Senior Notes Maturing October 2027
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	5.88%
Total debt (net of premium and debt issuance costs)	$ 394,000		400,000
Senior Notes \| 7 1/4% Senior Notes Maturing October 2029
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)	7.25%
Total debt (net of premium and debt issuance costs)	$ 350,000		0
Senior Notes \| Senior Unsecured Term Loans September 2022
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)		4.875%
Junior Subordinated Notes (net of unamortized accretion of $34,703 and $36,770, respectively)
Debt Instrument [Line Items]
Debt instrument stated interest rate (percent)				7.987%
Total debt (net of premium and debt issuance costs)	66,070		64,003
Other Secured Notes Payable
Debt Instrument [Line Items]
Total debt (net of premium and debt issuance costs)	$ 1,154		$ 4,113