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Fair Value Measurements - Fair Value of Debt (Details) - Fixed rate debt - Level 2 - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Total debt | $ 688,363 | $ 686,747
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Total debt | $ 696,000 | $ 702,000

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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