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Recently Adopted and Recently Issued Accounting Standards - (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease assets | $ 50,470 |  | $ 0 |
Operating lease, liability | 50,521 |  |  |
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease assets |  | $ 54,000 |  |
Operating lease, liability |  | 54,000 |  |
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of the adoption of new accounting pronouncements | 3,772 |  |  |
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of the adoption of new accounting pronouncements |  | 3,800 |  |
Accumulated Other Comprehensive Loss |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of the adoption of new accounting pronouncements | (3,772) |  |  |
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect of the adoption of new accounting pronouncements | $ (3,772) | $ (3,800) |  | $ 0

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