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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 4 (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Note payable to banks |  |  |
Line of credit facility, current borrowing capacity | $ 200,000,000 |  |
Parent |  |  |
Note payable to banks |  |  |
Line of credit facility, current borrowing capacity | 30,000,000 |  |
Notes receivable, related parties | 26,000,000 | $ 6,000,000 |
Notes payable, related parties | $ 0 |  |
Syndicated revolving credit facility |  |  |
Note payable to banks |  |  |
Variable rate basis | LIBOR |  |
Syndicated revolving credit facility | Minimum |  |  |
Note payable to banks |  |  |
Interest coverage ratio | 3.25 |  |
Syndicated revolving credit facility | Maximum |  |  |
Note payable to banks |  |  |
Total funded debt ratio | 0.65 |  |
Parent Company |  |  |
Note payable to banks |  |  |
Line of credit facility, current borrowing capacity | $ 200,000,000 |  |
Parent Company | Syndicated revolving credit facility |  |  |
Note payable to banks |  |  |
Interest coverage ratio | 8.21 |  |
Total funded debt ratio | 0.47 |  |
Parent Company | Syndicated revolving credit facility | Minimum |  |  |
Note payable to banks |  |  |
Interest coverage ratio | 3.25 |  |
Total funded debt ratio | 0.65 |  |
Parent Company | Syndicated revolving credit facility | Maximum |  |  |
Note payable to banks |  |  |
Total funded debt ratio | 1.00 |  |
Parent Company | Syndicated revolving credit facility | Letters of credit |  |  |
Note payable to banks |  |  |
Maximum borrowing capacity | $ 25,000,000 |  |
Letter of credit, amount | $ 455,000 |  |
Letter of credit fee (as a percent) | 0.65% |  |
Subsidiaries |  |  |
Note payable to banks |  |  |
Dividends paid | $ (38,300,000) | $ (47,300,000) | $ (42,700,000)

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