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Schedule II (Details) - SEC Schedule, 12-09, Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | $ 0 | $ 7,594 | $ 6,285 | $ 0 | $ 4,526
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense | 0 | 3,298 | 3,807 |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment | 0 | 0 | 0 |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | $ 0 | $ 1,989 | $ 2,048 |  |

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