Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator for Earnings per Share Basic and Diluted:
Net income	$ 28,367	$ (33,072)	$ 60,268	$ (19,841)
Less: Income allocated to participating shares	141	0	283	0
Net Income Allocated to Shareholders	28,226	(33,072)	59,985	(19,841)
Net Income Available to Shareholders	$ 28,367	$ (33,072)	$ 60,268	$ (19,841)
Denominators for Earnings per Share:
Weighted average shares outstanding—basic (in shares)	39,048,971	39,013,161	39,039,007	39,142,351
Add: Potentially dilutive shares (in shares)	90,590	0	93,583	0
Denominator for Treasury Stock Method—Diluted (in shares)	39,139,561	39,013,161	39,132,590	39,142,351
Add: Average participating shares outstanding (in shares)	0	0	0	0
Denominator for Two-Class Method—Diluted (in shares)	39,048,971	39,013,161	39,039,007	39,142,351
Earnings per share—basic (in dollars per share)	$ 0.73	$ (0.85)	$ 1.54	$ (0.51)
Earnings per share—diluted (in dollars per share)	$ 0.72	$ (0.85)	$ 1.54	$ (0.51)
Restricted Stock
Denominators for Earnings per Share:
Stock options and restricted stock considered anti-dilutive excluded from potentially dilutive shares (in shares)	25	21,333	424	82,624