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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Jan. 01, 2018
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Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Credit to retained earnings |  | $ 4,454
Accounting Standards Update 2014-09 | Retained Earnings |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Credit to retained earnings |  | 4,454
Accounting Standards Update 2017-12 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Credit to retained earnings |  | (54)
Accounting Standards Update 2017-12 | Retained Earnings |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Credit to retained earnings |  | 432
Nonoperating Income (Expense) | Accounting Standards Update 2017-12 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Credit to retained earnings |  | $ 54
Scenario, Forecast | Minimum | Subsequent Event | Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Increase in net lease assets | $ 30,600 |
Increase in net lease liabilities | 32,400 |
Scenario, Forecast | Maximum | Subsequent Event | Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Increase in net lease assets | 33,800 |
Increase in net lease liabilities | $ 35,700 |

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