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EPS (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2019

Sep. 30, 2018

Sep. 30, 2019

Sep. 30, 2018

Earnings Per Share [Abstract]

Net income

$ 14,488

$ 14,057

$ 41,965

$ 39,094

Dividends and undistributed earnings allocated to participating securities

^[1]

(33)

(39)

(86)

(110)

Net income available to common shareholders

$ 14,455

$ 14,018

$ 41,879

$ 38,984

Weighted-average common shares outstanding for basic EPS

15,339,093

15,580,782

15,482,765

15,565,355

Dilutive effect of stock-based awards (shares)

^[2]

42,835

58,204

39,736

56,045

Weighted-average common and potential common shares for diluted EPS (shares)

15,381,928

15,638,986

15,522,501

15,621,400

Basic EPS (in dollars per share)

$ 0.94

$ 0.90

$ 2.70

$ 2.50

Diluted EPS (in dollars per share)

$ 0.94

$ 0.90

$ 2.70

$ 2.50

Antidilutive Stock options (shares)

0

0

0

0

[1]	(1)Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.
[2]	(2)Represents the effect of the assumed exercise of stock options and vesting of restricted shares and restricted stock units utilizing the treasury stock method. Not included are the unvested LTIP awards, which are the Company's performance-based awards.

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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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