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Fair Value Measurement of Financial Instruments
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurement of Financial Instruments Fair Value Measurement of Financial Instruments
Piedmont considers its cash and cash equivalents, tenant receivables, notes receivable, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of September 30, 2019 and December 31, 2018, respectively (in thousands):

 September 30, 2019December 31, 2018
Financial InstrumentCarrying ValueEstimated
Fair Value
Level Within Fair Value HierarchyCarrying ValueEstimated
Fair Value
Level Within Fair Value Hierarchy
Assets:
Cash and cash equivalents (1)
$10,284  $10,284  Level 1  $4,571  $4,571  Level 1  
Tenant receivables (1)
$10,091  $10,091  Level 1  $10,800  $10,800  Level 1  
Restricted cash and escrows (1)
$1,820  $1,820  Level 1  $1,463  $1,463  Level 1  
Interest rate swaps$—  $—  Level 2  $1,199  $1,199  Level 2  
Liabilities:
Accounts payable and accrued expenses (1)
$14,090  $14,090  Level 1  $47,328  $47,328  Level 1  
Interest rate swaps$6,862  $6,862  Level 2  $839  $839  Level 2  
Debt, net$1,879,244  $1,922,891  Level 2  $1,685,472  $1,698,213  Level 2  
(1)For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to their short-term maturity.

Piedmont's debt was carried at book value as of September 30, 2019 and December 31, 2018; however, to estimate its fair value as disclosed in the table above, Piedmont used widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its debt.

Piedmont’s interest rate swap agreements presented above (further discussed in Note 5) are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at estimated fair value as of September 30, 2019 and December 31, 2018. The estimated fair value of these derivative instruments was determined using widely accepted valuation techniques such as discounted cash flow analysis based on the contractual terms of the derivatives including the period to maturity of each instrument. Observable market-based inputs, including interest rate curves and implied volatilities, were also used. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the estimated fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments for both Piedmont and the counterparties that were at risk as of the valuation date. The credit risks of both Piedmont and its counterparties were factored into the calculation of the estimated fair value of the interest rate swaps; however, as of September 30, 2019 and December 31, 2018, this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs (Level 3) used to determine the estimated fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 assets or liabilities.