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Share-Based Payments - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercised (in shares) | (18) |  |
Share-based compensation expense |  | $ 5,507 | $ 5,910
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option grants expire (in years) |  | 7 years |
Grants, vesting period (in years) |  | 3 years |
Continuing Operations [Member] | Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected dividend yield (in hundredths) |  | 1.10% |
Expected stock price volatility |  | 24.10% |
Weighted Average Risk Free Interest Rate |  | 1.50% |
Expected life of options (in years) |  | 5 years 10 months 24 days |
Weighted-average fair value of options (dollars per share) |  | $ 14.79 |
Outstanding, beginning of period (in shares) |  | 417 |
Granted (in shares) |  | 36 |
Forfeited (in shares) |  | (4) |
Outstanding, end of period (in shares) |  | 449 |
Exercisable, end of period (in shares) |  | 317 |
Outstanding, beginning of period (in dollars per share) |  | $ 53 |
Grants in Period (in dollars per share) |  | 66 |
Forfeited in period (in dollars per share) |  | 60 |
Outstanding, end of period (in dollars per share) |  | 54 |
Exercisable, end of period (in dollars per share) |  | $ 51 |
Aggregate Intrinsic Value Outstanding, end of period |  | $ 247 |
Aggregate Intrinsic Value Exercisable, end of period |  | $ 1,379 |
Weighted-average remaining contractual term Outstanding, end of period (in years) |  | 3 years 10 months 24 days |
Weighted-average remaining contractual term Exercisable, end of period (in years) |  | 3 years 3 months 18 days |
Share-based compensation expense |  | $ 600 | 829
Tax benefit related to share-based expense |  | 153 | 212
Unrecognized share-based compensation, net of estimated forfeitures |  | $ 1,348 | 2,316
Weighted average period over which unrecognized compensation will be recognized (years) |  | 1 year 7 months 6 days |
Discontinued Operations [Member] | Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding, beginning of period (in shares) |  | 14 |
Outstanding, end of period (in shares) |  | 14 |
Exercisable, end of period (in shares) |  | 12 |
Outstanding, beginning of period (in dollars per share) |  | $ 52 |
Outstanding, end of period (in dollars per share) |  | 52 |
Exercisable, end of period (in dollars per share) |  | $ 52 |
Aggregate Intrinsic Value Outstanding, end of period |  | $ 37 |
Aggregate Intrinsic Value Exercisable, end of period |  | $ 41 |
Weighted-average remaining contractual term Outstanding, end of period (in years) |  | 3 years 3 months 18 days |
Weighted-average remaining contractual term Exercisable, end of period (in years) |  | 3 years 2 months 12 days |
Share-based compensation expense |  | $ 11 | 21
Tax benefit related to share-based expense |  | 3 | 5
Unrecognized share-based compensation, net of estimated forfeitures |  | $ 11 | $ 42
Weighted average period over which unrecognized compensation will be recognized (years) |  | 7 months 6 days |

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