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Share-Based Payments - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 1,962 | $ 1,952
Employee Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | 363 | 348
Tax benefit related to share-based expense | 134 | 129
Unrecognized share-based compensation, net of estimated forfeitures | $ 2,683 | $ 2,789
Weighted average period over which unrecognized compensation will be recognized (years) | 2 years 3 months 11 days |
Employee activity - stock options [Abstract] |  |
Stock option grants expire (in years) | 7 years |
Grants, vesting period (in years) | 3 years |
Expected dividend yield (in hundredths) | 1.30% | 1.00%
Expected stock price volatility | 28.70% | 29.00%
Weighted Average Risk Free Interest Rate | 2.00% | 1.30%
Expected life of options (in years) | 6 years 11 days | 6 years 11 days
Weighted-average fair value of options (dollars per share) | $ 13 | $ 12
Outstanding, beginning of period (in shares) | 564 |
Granted (in shares) | 118 |
Exercised (in shares) | (47) |
Forfeited (in shares) | (13) |
Outstanding, end of period (in shares) | 622 |
Exercisable, end of period (in shares) | 381 |
Outstanding, beginning of period (in dollars per share) | $ 41 |
Grants in Period (in dollars per share) | 48 |
Exercises in Period (in dollars per share) | 32 |
Forfeited in period (in dollars per share) | 46 |
Outstanding, end of period (in dollars per share) | 42 |
Exercisable, end of period (in dollars per share) | $ 40 |
Aggregate Intrinsic Value Outstanding, end of period | $ 3,765 |
Aggregate Intrinsic Value Exercisable, end of period | $ 3,334 |
Weighted-average remaining contractual term Outstanding, end of period (in years) | 4 years 4 months 11 days |
Weighted-average remaining contractual term Exercisable, end of period (in years) | 3 years 2 months 11 days |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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