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Summary Of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Unamortized debt issuance costs | $ 11,963 | $ 11,993
Accounting Standards Update 2015-03 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Unamortized debt issuance costs |  | $ 12,000

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