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Borrowings - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2016 | Oct. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) lender | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) lender | Jun. 30, 2017 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jan. 31, 2010 USD ($)
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of available borrowings under the Secured Revolving Credit Facility |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  | $ 145,300,000 |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 0 | $ 0 | 25,904,000 | $ 15,563,000 |  |  |  |
Non-cash loss on extinguishment of debt |  |  |  |  | 3,173,000 | 3,676,000 |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt, net |  |  | 1,326,503,000 |  | 1,326,503,000 |  |  |  | 1,327,412,000 |
Senior Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Early repayment of senior debt |  |  | 34,500,000 |  |  |  |  |  |  |
Senior Notes [Abstract] |  |  |  |  |  |  |  |  |  |
Non-cash loss on extinguishment of debt |  |  | 3,200,000 |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt, net |  |  | $ 1,258,890,000 |  | $ 1,258,890,000 |  |  |  | $ 1,259,840,000 |
Senior Notes | 5 7/8% Unsecured Senior Notes Maturing October 2027 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 400,000,000.0 |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) |  | 5.875% |  |  |  |  |  |  |  |
Senior Notes | 6 3/4% Senior Notes Maturing March 2025 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |
Stated interest rate on debt instrument (percent) |  |  |  | 6.75% |  | 6.75% |  |  |  |
Repurchase price upon change of control, percent of par |  |  |  | 101.00% |  | 101.00% |  |  |  |
Percentage of debt outstanding after repurchase |  |  |  | 35.00% |  | 35.00% |  |  |  |
Senior Notes | 6 3/4% Senior Notes Maturing March 2025 | Optional Redemption Under Indenture |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Percentage of debt outstanding after repurchase |  |  |  | 65.00% |  | 65.00% |  |  |  |
Redemption option, percent of par |  |  |  | 106.75% |  | 106.75% |  |  |  |
Senior Notes | 5 3/4% Senior Notes Maturing June 2019 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) |  |  | 5.75% |  | 5.75% |  |  |  | 5.75% |
Extinguishment of debt, amount |  |  | $ 225,000,000 |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt, net |  |  | $ 96,393,000 |  | $ 96,393,000 |  |  |  | $ 321,393,000 |
Senior Notes | 7 1/4% Senior Notes Maturing February 2023 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) |  |  | 7.25% |  | 7.25% |  |  |  | 7.25% |
Extinguishment of debt, amount |  |  | $ 175,000,000 |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt, net |  |  | 24,834,000 |  | $ 24,834,000 |  |  |  | $ 199,834,000 |
Senior Notes | Debt Instrument, Redemption, Period Two | 5 7/8% Unsecured Senior Notes Maturing October 2027 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 35.00% |  |  |  |  |  |  |  |
Redemption price (as a percentage) |  | 105.875% |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount outstanding after redemption |  | 65.00% |  |  |  |  |  |  |  |
Repurchase price upon change of control, percent of par |  |  |  | 101.00% |  | 101.00% |  |  |  |
Senior Notes | Debt Instrument, Redemption, Period Two | 5 3/4% Senior Notes Maturing June 2019 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Redemption price (as a percentage) |  |  |  |  |  |  |  |  |  |
Senior Notes | Debt Instrument, Redemption, Period Two | 7 1/4% Senior Notes Maturing February 2023 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Redemption price (as a percentage) |  |  |  |  | 102.417% |  |  |  |  |
Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (percent) | 7.987% |  |  |  |  |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |  |  |  |  |  |
Effective period of debt instrument interest rate | 10 years |  |  |  |  |  |  |  |  |
Face amount modification |  |  |  |  |  |  |  |  |  | $ 75,000,000
Unamortized accretion |  |  | $ 37,286,000 |  | $ 37,286,000 |  |  |  | 38,837,000 |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Weighted average fixed interest rate of debt (percent) |  |  | 4.81% |  | 4.81% |  |  |  |  |
Total debt, net |  |  | $ 63,487,000 |  | $ 63,487,000 |  |  |  | 61,937,000 |
Other secured notes payable |  |  |  |  |  |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |  |  |  |  |  |
Weighted average fixed interest rate of debt (percent) |  |  | 1.56% |  | 1.56% |  |  |  |  |
Total debt, net |  |  | $ 4,126,000 |  | $ 4,126,000 |  |  |  | 5,635,000 |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  | 200,000,000.0 |  | 200,000,000.0 |  |  | $ 180,000,000.0 |  |
Inventory assets pledged as collateral |  |  | $ 800,000,000 |  | $ 800,000,000 |  |  |  |  |
Number of lenders | lender |  |  | 3 |  | 3 |  |  |  |  |
Letters of credit secured using cash collateral |  |  | $ 0 |  | $ 0 |  |  |  | 34,700,000 |
Line of credit |  |  | 0 |  | 0 |  |  |  | 0 |
Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Line of credit facility, allowed increase in borrowing capacity |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |
Aggregate collateral ratio |  |  | 4.00 |  | 4.00 |  |  |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Line of credit facility, allowed increase in borrowing capacity |  |  | $ 50,000,000 |  | $ 50,000,000 |  |  |  |  |
Aggregate collateral ratio |  |  | 1.00 |  | 1.00 |  |  |  |  |
Letter of Credit, Cash Secured |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Letters of credit secured using cash collateral |  |  | $ 10,800,000 |  | $ 10,800,000 |  |  |  | $ 10,800,000 |
Standby Letters of Credit | Standby Letters for Credit Facility |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  | $ 50,000,000.0 |  |  |
Letters of credit secured using cash collateral |  |  | $ 26,400,000 |  | $ 26,400,000 |  |  |  |  |
Standby Letters of Credit | Backstop Standby Letters of Credit |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  | $ 30,000,000 |  |  |

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