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Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information                      
Revenues $ 46,273 $ 38,173 $ 28,481 $ 46,410 $ 46,463 $ 47,119 $ 46,266 $ 45,456 $ 159,337 $ 185,304 $ 168,645
Net income available to common stockholders $ 17,470 $ 12,114 $ 1,773 $ 63,370 $ 12,449 $ 27,080 $ 20,352 $ 20,254      
Net income per common share available to common stockholders:                      
Basic (in dollars per share) $ 0.45 $ 0.31 $ 0.05 $ 1.60 $ 0.31 $ 0.68 $ 0.51 $ 0.51 $ 2.42 $ 2.03 $ 3.91
Diluted (in dollars per share) 0.45 0.31 0.05 1.60 0.31 0.68 0.51 0.51 2.42 2.02 3.89
Dividends declared and paid per common share 0.57 0.57 0.57 0.57 0.57 0.57 0.57 0.57      
Dividends declared and paid per common share (in dollars per share) $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 0.57 $ 2.280 $ 2.280 $ 2.280