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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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New Accounting Pronouncement, Early Adoption |  |  |
Lease liability | $ 29,798 |  |
Right of use assets | 29,798 |  |
Deferred income taxes | 19,749 |  | $ 6,311
Accounting Standards Update 2016-02 | Minimum |  |  |
New Accounting Pronouncement, Early Adoption |  |  |
Lease liability |  | $ 33,100 |
Accounting Standards Update 2016-02 | Maximum |  |  |
New Accounting Pronouncement, Early Adoption |  |  |
Right of use assets |  | $ 33,100 |
Adjustment | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncement, Early Adoption |  |  |
Lease liability | 33,100 |  |
Right of use assets | $ 33,100 |  |

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