Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic earnings per share
Net income	$ 14,639	$ 16,642	$ 26,294	$ 27,458
Weighted average common shares outstanding (in shares)	43,781,249	45,055,117	44,219,880	41,956,047
Basic Earnings Per Share (in USD per share)	$ 0.33	$ 0.37	$ 0.59	$ 0.65
Diluted earnings per share
Net income	$ 14,639	$ 16,642	$ 26,294	$ 27,458
Effect of dilutive securities:
Weighted average common shares outstanding (in shares)	43,802,794	45,130,408	44,286,864	42,032,971
Diluted Earnings Per Share (in USD per share)	$ 0.33	$ 0.37	$ 0.59	$ 0.65
Restricted Stock
Effect of dilutive securities:
Effect of dilutive securities	7,614	0	40,017	0
Stock Options
Effect of dilutive securities:
Effect of dilutive securities	13,931	75,291	26,967	76,924

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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