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Description of the Business and Summary of Significant Accounting Policies - Deferred Financing Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest Expense, Debt [Abstract] |  |  |
Amortization of deferred financing costs | $ 5,632 | $ 5,350 | $ 4,863
Gain (Loss) on Extinguishment of Debt [Abstract] |  |  |
Write-off of deferred financing costs | 1,956 | 925 |
Interest Expense [Member] |  |  |
Gain (Loss) on Extinguishment of Debt [Abstract] |  |  |
Write-off of deferred financing costs | $ 2,000 | $ 900 |

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