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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Fair value of certain financial assets and liabilities and other financial instruments | The fair value of certain financial assets and liabilities and other financial instruments as of June 30, 2018 and December 31, 2017, in thousands, is as follows:
| June 30, 2018 |  | December 31, 2017
| Carrying Amount (1) |  | Fair Value |  | Carrying Amount (1) |  | Fair Value
Debt | $ | 934,522 |  |  | $ | 919,752 |  |  | $ | 937,792 |  |  | $ | 942,529 |
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(1) | The carrying amount of debt is net of unamortized debt issuance costs.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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