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Fair Value of Financial Instruments
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair value of financial instruments Fair Value of Financial Instruments
The following methods and assumptions were used to estimate the fair value of each class of financial instrument for which it is practical to estimate that value.
Cash and cash equivalents - The carrying amount approximates fair value due to the short term maturity of these investments.
Borrowings under the Unsecured Credit Facility and the Term Loans Due 2024 and 2026 - The carrying amount approximates fair value because the borrowings are based on variable market interest rates.
Senior Notes and Mortgage Notes payable - The fair value of notes and bonds payable is estimated using cash flow analyses, based on the Company’s current interest rates for similar types of borrowing arrangements.
Interest rate swap agreements - Interest rate swap agreements are recorded in other liabilities on the Company's Consolidated Balance Sheets at fair value. Fair value is estimated by utilizing pricing models that consider forward yield curves and discount rates.
The table below details the fair values and carrying values for notes and bonds payable at September 30, 2020 and December 31, 2019.
 September 30, 2020December 31, 2019
Dollars in millionsCARRYING VALUEFAIR VALUECARRYING VALUEFAIR VALUE
Notes and bonds payable 1
$1,554.4 $1,621.7 $1,414.1 $1,425.8 
1Level 2 – model-derived valuations in which significant inputs and significant value drivers are observable in active markets.