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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Stock-Based Compensation [Abstract] |
Summary of Restricted Stock Activity | Following is a summary of the activity of the restricted stock:
|  | Nine Months Ended
|  | September 30, 2013
|  | Shares |  | Fair Value
Balance at December 31, 2012 |  | 54,875 |  |  | $ | 31.61
Granted |  | 30,185 |  |  | $ | 42.03
Vested |  | (25,608 | ) |  | $ | 30.48
Balance at September 30, 2013 |  | 59,452 |  |  | $ | 37.39
Summary of SARs Activity | Following is a summary of the activity of the Company's SARs program for the nine-month period ended September 30, 2013:
|  |  |  |  | Weighted- |  | Average |  | Aggregate
|  |  |  |  | Average |  | Remaining |  | Intrinsic
|  |  |  |  | Exercise |  | Contractual |  | Value
|  | Shares |  | Price |  | Term Years |  | (In thousands)
Outstanding at December 31, 2012 |  | 351,881 |  |  | $ | 27.52 |  | 7.34 |  | $ | 4,988
Granted |  | 85,943 |  |  | $ | 42.14 |  |  |  |  |
Exercised |  | (76,259 | ) |  | $ | 24.95 |  |  |  |  |
Outstanding at September 30, 2013 |  | 361,565 |  |  | $ | 31.58 |  | 7.42 |  | $ | 7,877
Exercisable at September 30, 2013 |  | 184,437 |  |  | $ | 26.28 |  | 6.15 |  | $ | 4,997
Summary of Non-vested SARs Activity | Following is a summary of the activity of the non-vested SARs during the nine-month period ended September 30, 2013:
|  |  |  |  | Weighted-Average
|  | Shares |  | Grant Date Fair Value
Non-vested at December 31, 2012 |  | 161,294 |  |  | $ | 31.70
Granted |  | 85,943 |  |  | $ | 42.14
Vested |  | (70,109 | ) |  | $ | 30.85
Non-vested at September 30, 2013 |  | 177,128 |  |  | $ | 37.11
Schedule of Assumptions used in SARs Granted | The Company uses the Black-Scholes pricing model to determine the fair value of the SARs at the date of grant. Following are the assumptions used to estimate the per-share fair value of SARs granted:
|  | Nine Months Ended September 30,
|  | 2013 |  | 2012
Risk-free interest rate |  | 1.29% |  | 1.38%
Expected life |  | 7 yrs. |  | 7 yrs.
Expected volatility |  | 28.72% |  | 29.39%
Expected dividend yield |  | 1.71% |  | 1.84%

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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