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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity Incentive Plan, shares authorized | 1,500,000 |
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation cost | $ 2,204 |
Total unrecognized compensation expense, weighted average period | 11 months 26 days |
Vesting period | 3 years |
Granted, Shares | 35,002 |
Outstanding, Shares | 121,462 | 99,724
Fair value of granted shares per share | $ 49.02 |
Performance-based restricted shares [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Granted, Shares | 36,403 |
Performance-based restricted shares [Member] | February 2017 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding, Shares | 30,057 |
Percentage of target opportunity for awards to vest | 120.00% |
Fair value of granted shares per share | $ 49.33 |
Expense incurred to grant shares | $ 595 |
Expiry period | 3 years |
Maturity date | Dec. 31, 2019 |
Performance-based restricted shares [Member] | February 2017 [Member] | Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of target opportunity for awards to vest | 0.00% |
Performance-based restricted shares [Member] | February 2017 [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of target opportunity for awards to vest | 150.00% |
Performance-based restricted shares [Member] | February and July 2018 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding, Shares | 35,258 |
Percentage of target opportunity for awards to vest | 117.00% |
Fair value of granted shares per share | $ 49.04 |
Expense incurred to grant shares | $ 674 |
Expiry period | 3 years |
Maturity date | Dec. 31, 2020 |
Performance-based restricted shares [Member] | February and July 2018 [Member] | Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of target opportunity for awards to vest | 0.00% |
Performance-based restricted shares [Member] | February and July 2018 [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of target opportunity for awards to vest | 150.00% |
Performance-based restricted shares [Member] | February 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding, Shares | 36,403 |
Percentage of target opportunity for awards to vest | 108.00% |
Fair value of granted shares per share | $ 49.10 |
Expense incurred to grant shares | $ 590 |
Expiry period | 3 years |
Maturity date | Dec. 31, 2021 |
Performance-based restricted shares [Member] | February 2019 [Member] | Minimum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of target opportunity for awards to vest | 0.00% |
Performance-based restricted shares [Member] | February 2019 [Member] | Maximum [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Percentage of target opportunity for awards to vest | 150.00% |
SARs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted, Shares | 0 |
Outstanding, Shares |  | 237,121

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