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Borrowings - Schedule of Long-term Debt (Details) - USD ($) | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 15, 2006
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 1,327,412,000 |  | $ 1,331,878,000 |
Debt Instrument, Unamortized Premium | $ (3,413,000) |  | $ (2,362,000) |
5 3/4% Senior Notes Maturing June 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 5.75% |  | 5.75% |
7 1/2% Senior Notes Maturing September 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 7.50% |  | 7.50% |
8 3/4% Senior Notes Maturing March 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 8.75% |  | 8.75% |
7 1/4% Senior Notes Maturing February 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 7.25% |  | 7.25% |
6 3/4% Senior Notes Maturing March of 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument stated interest rate (percent) | 6.75% |  |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 1,259,840,000 |  | $ 1,207,526,000 |
Unamortized debt issuance costs | (14,800,000) |  | (14,063,000) |
Debt Instrument, Unamortized Premium | 3,413,000 |  | 2,362,000 |
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 321,393,000 |  | 321,393,000 |
Debt instrument stated interest rate (percent) | 5.75% |  |  |
Senior Notes | 7 1/2% Senior Notes Maturing September 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 0 |  | 198,000,000 |
Debt instrument stated interest rate (percent) | 7.50% |  |  |
Senior Notes | 8 3/4% Senior Notes Maturing March 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 500,000,000 |  | 500,000,000 |
Debt instrument stated interest rate (percent) | 8.75% |  |  |
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 199,834,000 |  | 199,834,000 |
Debt instrument stated interest rate (percent) | 7.25% |  |  |
Senior Notes | 6 3/4% Senior Notes Maturing March of 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 250,000,000 |  | 0 |
Debt instrument stated interest rate (percent) |  | 6.75% |  |
Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | 0 |  | 52,669,000 |
Debt Instrument, Unamortized Discount | 0 |  | 880,000 |
Unamortized debt issuance costs | 0 |  | (1,451,000) |
Junior Subordinated Notes (net of unamortized accretion of $38,837 and $40,903, respectively) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | 61,937,000 |  | 59,870,000 |
Debt Instrument, Unamortized Discount | 38,837,000 |  | 40,903,000 |
Debt instrument stated interest rate (percent) |  |  |  | 7.987%
Other Secured Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total debt (net of premium/discount and debt issuance costs) | $ 5,635,000 |  | $ 11,813,000 |

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