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Borrowings - Narrative (Details) | Jul. 30, 2016 | Dec. 31, 2018 USD ($) lender | Sep. 30, 2018 USD ($) | May 31, 2018 USD ($) | Jan. 31, 2010 USD ($)
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Line of Credit Facility [Abstract] |  |  |  |  |
Amount of available borrowings under the Secured Revolving Credit Facility |  | $ 183,500,000 | $ 200,000,000 |  |
Senior Notes [Abstract] |  |  |  |  |
Ownership interest In guarantor subsidiaries |  | 100.00% |  |  |
Secured Debt [Abstract] |  |  |  |  |
Total debt, net |  | $ 1,255,784,000 | 1,231,254,000 |  |
Junior Subordinated Notes |  |  |  |  |
Junior Subordinated Notes [Abstract] |  |  |  |  |
Stated interest rate on debt instrument (percent) | 7.987% |  |  |  |
Effective period of debt instrument interest rate | 10 years |  |  |  |
Face amount modification |  |  |  |  | $ 75,000,000
Unamortized accretion |  | 36,253,000 | 36,770,000 |  |
Secured Debt [Abstract] |  |  |  |  |
Total debt, net |  | $ 64,520,000 | 64,003,000 |  |
Weighted average fixed interest rate of debt (percent) |  | 4.97% |  |  |
Other secured notes payable |  |  |  |  |
Secured Debt [Abstract] |  |  |  |  |
Total debt, net |  | $ 2,634,000 | 4,113,000 |  |
Weighted average fixed interest rate of debt (percent) |  | 1.88% |  |  |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Credit facility borrowing capacity |  | $ 210,000,000.0 | 200,000,000.0 |  |
Inventory assets pledged as collateral |  | $ 800,000,000 |  |  |
Number of lenders | lender |  | 3 |  |  |
Borrowings outstanding |  | $ 25,000,000 | 0 |  |
Letters of credit secured using cash collateral |  | $ 1,500,000.0 | 0 |  |
Revolving Credit Facility | Maximum |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Aggregate collateral ratio |  | 4.00 |  |  |
Revolving Credit Facility | Minimum |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Aggregate collateral ratio |  | 1.00 |  |  |
Letter of Credit, Cash Secured |  |  |  |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Letters of credit secured using cash collateral |  | $ 11,200,000 | $ 10,400,000 |  |
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 |  | $ 28,500,000 |  |  |
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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