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Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets: |  |
Total investment securities | $ 37,273 | $ 30,460
Prepaid expenses and other current assets |  |
Financial Assets: |  |
Executive deferred compensation plan trust | 900 | 900
Other assets |  |
Financial Assets: |  |
Executive deferred compensation plan trust | 8,700 | 7,000
Municipal bonds |  |
Financial Assets: |  |
Total investment securities | 197 | 302
Asset-backed securities |  |
Financial Assets: |  |
Total investment securities | 210 | 247
Mortgage-backed securities |  |
Financial Assets: |  |
Total investment securities | 138 | 174
Pooled investment fund measured at net asset value |  |
Financial Assets: |  |
Total investment securities | 9,000 | 5,000
Interest rate swaps | Prepaid expenses and other current assets |  |
Financial Assets: |  |
Derivative asset |  | 2,400
Interest rate swaps | Other current liabilities |  |
Liabilities: |  |
Interest rate swaps | 22,000 | 6,700
Interest rate swaps | Other liabilities |  |
Liabilities: |  |
Interest rate swaps | 22,900 | 13,100
Level 1 |  |
Financial Assets: |  |
Executive deferred compensation plan trust | 9,586 | 7,965
Level 1 | Money market funds |  |
Financial Assets: |  |
Money market funds | 335,449 | 223,217
Level 1 | Fixed-income mutual fund |  |
Financial Assets: |  |
Total investment securities | 27,728 | 24,737
Level 2 | Municipal bonds |  |
Financial Assets: |  |
Total investment securities | 197 | 302
Level 2 | Asset-backed securities |  |
Financial Assets: |  |
Total investment securities | 210 | 247
Level 2 | Mortgage-backed securities |  |
Financial Assets: |  |
Total investment securities | 138 | 174
Level 2 | Interest rate swaps |  |
Financial Assets: |  |
Derivative asset | 0 | 2,395
Liabilities: |  |
Interest rate swaps | 44,938 | 19,764
Net Asset Value | Pooled investment fund measured at net asset value |  |
Financial Assets: |  |
Total investment securities | $ 9,000 | $ 5,000

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