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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Stock-Based Compensation [Abstract] |
Summary of Restricted Stock Activity |
|  | Six Months Ended
|  | June 30, 2015
|  | Shares |  | Fair Value |
Balance at December 31, 2014 |  | 51,161 |  |  | $ | 48.13
Granted |  | 41,518 |  |  | $ | 51.04
Vested |  | (24,644 | ) |  | $ | 44.18
Forfeits |  | (262) |  |  | $ | 52.63
Balance at June 30, 2015 |  | 67,773 |  |  | $ | 51.33
Summary of SARs Activity |
|  |  |  |  | Weighted- |  | Average |  | Aggregate
|  |  |  |  | Average |  | Remaining |  | Intrinsic
|  |  |  |  | Exercise |  | Contractual |  | Value
|  | Shares |  | Price |  | Term Years |  | (In thousands)
Outstanding at December 31, 2014 |  | 353,955 |  |  | $ | 35.52 |  | 6.77 |  | $ | 6,277 |
Exercised |  | (37,834 | ) |  | $ | 28.56 |  |  |  |  |
Forfeits |  | (1,204 | ) |  | $ | 53.96 |  |  |  |  |
Outstanding at June 30, 2015 |  | 314,917 |  |  | $ | 36.28 |  | 6.45 |  |  | 6,279
Exercisable at June 30, 2015 |  | 262,410 |  |  | $ | 33.30 |  | 6.11 |  | $ | 6,014
Summary of Non-vested SARs Activity |
|  |  |  |  | Weighted-Average |
|  | Shares |  | Grant Date Fair Value |
Non-vested at December 31, 2014 |  | 124,982 |  |  | $ | 45.85
Vested |  | (71,514 | ) |  | $ | 41.87
Forfeits |  | (961 | ) |  | $ | 52.02
Non-vested at June 30, 2015 |  | 52,507 |  |  | $ | 51.17
Schedule of Assumptions used in SARs Granted |
|  | Six Months Ended June 30,
|  | 2015 |  | 2014
Risk-free interest rate |  | N/A |  | 2.38 | %
Expected life |  | N/A |  | 7 yrs. |
Expected volatility |  | N/A |  | 28.11 | %
Expected dividend yield |  | N/A |  | 1.30 | %

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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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- 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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