Debt Obligations - Future Maturities (Details) - USD ($)		1 Months Ended	12 Months Ended
	Feb. 17, 2022	Jan. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2022
Scheduled Principal Payments
2022			$ 48,160,000
2023			49,160,000
2024			49,160,000
2025			210,400,000
2026			101,500,000
Thereafter			265,500,000
Total			723,880,000
Other information
Borrowings			304,400,000	$ 24,000,000	$ 207,900,000
Term loans, net of debt issue cost			722,719,000	649,382,000
Available for borrowing			289,100,000	510,100,000
Payments on debt			230,560,000	68,160,000	159,667,000
Subsequent Event
Other information
Available for borrowing		$ 267,100,000
Bank Borrowings
Scheduled Principal Payments
2025			110,900,000
Total			110,900,000
Other information
Borrowings			204,400,000	24,000,000	107,900,000
Term loans, net of debt issue cost			110,900,000	89,900,000
Available for borrowing			289,100,000	510,100,000
Payments on debt			183,400,000	28,000,000	126,000,000
Bank Borrowings | Subsequent Event
Other information
Borrowings		22,000,000
Term loans, net of debt issue cost		132,900,000
Available for borrowing		267,100,000
Senior Unsecured Notes
Scheduled Principal Payments
2022			48,160,000
2023			49,160,000
2024			49,160,000
2025			49,500,000
2026			51,500,000
Thereafter			265,500,000
Total			512,980,000
Other information
Borrowings					100,000,000
Term loans, net of debt issue cost	$ 505,456,000		512,456,000	559,482,000
Payments on debt	7,000,000		47,160,000	$ 40,160,000	33,667,000
Senior Unsecured Notes | Subsequent Event
Other information
Term loans, net of debt issue cost	505,456,000	$ 132,900,000				$ 505,456,000
Payments on debt	$ 7,000,000
Senior Unsecured Notes | Private Shelf Agreement Prudential
Other information
Face amount of debt					$ 100,000,000
Term loans
Scheduled Principal Payments
2025			50,000,000
2026			50,000,000
Total			100,000,000
Other information
Borrowings			100,000,000
Term loans, net of debt issue cost			$ 99,363,000