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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator [Abstract]
Net income	$ 64,540	$ 59,228	$ 51,493
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,724,000	17,687,000	17,631,000
Diluted earnings per share [Abstract]
Dilutive effect of equity grants (in shares)	16,000	16,000	22,000
Adjusted weighted average shares (in shares)	17,740,000	17,703,000	17,653,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 3.64	$ 3.35	$ 2.92
Diluted earnings per share (in dollars per share)	$ 3.64	$ 3.35	$ 2.92
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0	0	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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