Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Numerator
Net income	$ 142,496	$ 101,652
Denominator
Weighted average common shares outstanding - basic	33,530,610	33,563,903
Dilutive effect of restricted stock units	411,624	320,372
Weighted average common shares outstanding - diluted	33,942,234	33,884,275
Earnings per share:
Basic	$ 4.25	$ 3.03
Diluted	$ 4.20	$ 3.00

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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- Definition

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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