Equity and EPS - Computations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Operations:
Net income	$ 9,842	$ 9,720
Less: Income attributable to participating securities	66	66
Net income attributable to common shareholders and used in earnings per share calculation	$ 9,776	$ 9,654
Share information:
Basic and diluted weighted average common shares (in shares)	17,013,925	16,967,631
Basic and diluted EPS (in dollars per share)	$ 0.57	$ 0.57

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