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Fair Value of Financial Instruments | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | Fair Value of Financial Instruments The fair value of certain financial assets and liabilities and other financial instruments as of June 30, 2019 and December 31, 2018, in thousands, is as follows:
| June 30, 2019 |  | December 31, 2018
| Carrying Amount (1) |  | Fair Value |  | Carrying Amount (1) |  | Fair Value
Debt | $ | 1,076,759 |  |  | $ | 1,083,095 |  |  | $ | 977,966 |  |  | $ | 960,447 |
Interest rate swap agreements | $ | 1,647,029 |  |  | $ | 1,647,029 |  |  | $ | — |  |  | $ | — |
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(1) | The carrying amount of debt is net of unamortized debt issuance costs.
The fair value of our debt is a Level 2 measurement under the fair value hierarchy (see Note 2). We estimate the fair value of our debt by discounting the future cash flows of each instrument at estimated market rates. The fair value of our interest rate swaps is a Level 2 measurement under the fair value hierarchy. We estimate the fair value of the interest rate swap based on the interest rate yield curve and implied market volatility as inputs and adjusted for the counterparty's credit risk. We concluded the inputs for the credit risk valuation adjustment are Level 3 inputs, however these inputs are not significant to the fair value measurement in its entirety. The carrying value of our other financial instruments approximate fair value due to the short-term nature of these financial instruments.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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