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Fair Value Measurements - Fair Value of Debt (Details) - Level 2 - Fixed rate debt - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, fair value	$ 690,001	$ 686,747
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, fair value	$ 674,000	$ 702,000

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

+ Details

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