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Fair Value Measurements (Fair Values of the Company's Financial Assets and Liabilities) (Details) - Recurring Basis - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate and municipal bonds $ 3,039 $ 3,855
Fair value measurement 92,443 74,817
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps related to variable rate loans (279) (902)
Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 5,102 9,089
Restricted short-term investments 2,200 2,200
Money market    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 82,146 58,710
Restricted cash 235 1,865
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value measurement 82,381 60,575
Level 1 | Money market    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 82,146 58,710
Restricted cash 235 1,865
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate and municipal bonds 3,039 3,855
Fair value measurement 10,062 14,242
Level 2 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps related to variable rate loans (279) (902)
Level 2 | Certificates of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 5,102 9,089
Restricted short-term investments $ 2,200 $ 2,200