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Share-Based Payments - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 1,939 | $ 2,093 | $ 5,965 | $ 6,204
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 294 | 377 | 993 | 1,101
Tax benefit related to share-based expense | 105 | 140 | 354 | 407
Unrecognized share-based compensation, net of estimated forfeitures | $ 1,909 | $ 2,036 | $ 1,909 | $ 2,036
Weighted average period over which unrecognized compensation will be recognized (years) | 1 year 10 months 11 days |  | 1 year 10 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% |  | 1.30% | 1.00%
Expected stock price volatility | 28.70% |  | 28.70% | 29.00%
Weighted Average Risk Free Interest Rate | 2.00% |  | 2.00% | 1.30%
Expected life of options (in years) | 6 years 11 days |  | 6 years 11 days | 6 years 11 days
Weighted-average fair value of options (dollars per share) | $ 14 |  | $ 13 | $ 12
Outstanding, beginning of period (in shares) | 507 |  | 564 |
Granted (in shares) | 5 |  | 123 |
Exercised (in shares) | (18) |  | (169) |
Forfeited (in shares) | (22) |  | (46) |
Outstanding, end of period (in shares) | 472 |  | 472 |
Exercisable, end of period (in shares) | 255 |  | 255 |
Outstanding, beginning of period (in dollars per share) | $ 44 |  | $ 41 |
Grants in Period (in dollars per share) | 54 |  | 48 |
Exercises in Period (in dollars per share) | 41 |  | 34 |
Forfeited in period (in dollars per share) | 47 |  | 46 |
Outstanding, end of period (in dollars per share) | 44 |  | 44 |
Exercisable, end of period (in dollars per share) | $ 42 |  | $ 42 |
Aggregate Intrinsic Value Outstanding, end of period | $ 3,963 |  | $ 3,963 |
Aggregate Intrinsic Value Exercisable, end of period | $ 2,671 |  | $ 2,671 |
Weighted-average remaining contractual term Outstanding, end of period (in years) | 4 years 6 months 11 days |  | 4 years 6 months 11 days |
Weighted-average remaining contractual term Exercisable, end of period (in years) | 3 years 3 months 11 days |  | 3 years 3 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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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: 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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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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