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Fair Value Disclosures (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Estimated Fair Values and Carrying Amounts of Assets and Liabilities
Level in Fair Value HierarchySeptember 30, 2021December 31, 2020
Carrying
 Amount
Fair
Value
Carrying
 Amount
Fair
Value
Assets:
Cash and cash equivalents1$22,644 $22,644 $17,439 $17,439 
Liabilities:
Debt2997,853 1,049,500 996,815 1,076,000