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Summary of Significant Accounting Policies - Newly Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Jun. 30, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease assets | $ 180,600 | $ 173,854
Present value of lease liabilities |  | $ 175,072
Straight-line rent liability | 5,100 |
Prepaid rent | 4,900 |
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease assets | 175,700 |
Present value of lease liabilities | $ 181,600 |

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