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Basis of Presentation - Covid 19 (Details) - USD ($) $ / shares in Units, $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Apr. 23, 2020 | Mar. 31, 2020
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Debt Instrument [Line Items] |  |  |  |
Cash and cash equivalents - unrestricted | $ 67,138 | $ 56,697 |  | $ 662,156
Revolving Credit Facility [Member] | $700 Million Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Remaining borrowing capacity | $ 699,700 |  |  |
Sixth Amended And Restated Credit Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Dividends permitted amount per quarter |  |  | $ 0.01 |

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