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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended
	Apr. 29, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt:
Repayment paid						$ 28,000
Outstanding Balance					$ 659,421		$ 649,382
Available for borrowing					$ 493,100		510,100
Equity
Dividends declared and paid per common share					$ 0.57	$ 0.57
Bank Borrowings
Debt:
Repayment paid						$ 28,000
Outstanding Balance					$ 106,900		89,900
Available for borrowing					$ 493,100		$ 510,100
Subsequent Event \| Dividend Payable, April 30, 2021
Equity
Dividends declared and paid per common share				$ 0.19
Subsequent Event \| Dividend Payable, April 30, 2021 \| Common Stock
Equity
Dividends declared and paid per common share				$ 0.19
Subsequent Event \| Dividend Payable, May 28, 2021
Equity
Dividends declared and paid per common share			$ 0.19
Subsequent Event \| Dividend Payable, May 28, 2021 \| Common Stock
Equity
Dividends declared and paid per common share			$ 0.19
Subsequent Event \| Dividend Payable, June 30, 2021
Equity
Dividends declared and paid per common share		$ 0.19
Subsequent Event \| Dividend Payable, June 30, 2021 \| Common Stock
Equity
Dividends declared and paid per common share		$ 0.19
Subsequent Event \| Bank Borrowings
Debt:
Repayment paid	$ 5,000
Outstanding Balance	101,900
Available for borrowing	$ 498,100