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Fair Value Measurements Summary of Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Recorded value | $ 1,823,040 | $ 1,065,180
Deferred financing costs | 16,042 | 9,024
Fair Value Level 3 |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Fair value | $ 1,765,151 | $ 1,056,990

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