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Stock Award Plans | 12 Months Ended
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Dec. 31, 2015
Stock Award Plans [Abstract] |
Stock Award Plans | (7) Stock Award Plans The Company has share-based compensation plans which are described below. The compensation cost that has been charged against earnings for the Company’s stock award plans and the income tax benefit recognized in the statement of earnings for stock awards for the years ended December 31, 2015, 2014 and 2013 were as follows (in thousands):
|  | 2015 |  |  | 2014 |  |  | 2013 |
Compensation cost |  | $ | 11,104 |  |  | $ | 11,591 |  |  | $ | 11,621 |
Income tax benefit |  | $ | 4,120 |  |  | $ | 4,358 |  |  | $ | 4,370 |
The Company has an employee stock award plan for selected officers and other key employees which provides for the issuance of stock options, restricted stock and performance awards. The exercise price for each option equals the fair market value per share of the Company’s common stock on the date of grant. The terms of the options are seven years and vest ratably over three years. No performance awards payable in stock have been awarded under the plan. At December 31, 2015, 2,329,238 shares were available for future grants under the employee plan and no outstanding stock options under the employee plan were issued with stock appreciation rights. The following is a summary of the stock option activity under the employee plan described above for the years ended December 31, 2015, 2014 and 2013:
|  | Outstanding Non- Qualified or Nonincentive Stock Awards |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2012 |  |  | 351,173 |  |  | $ | 45.54 |
Granted |  |  | 111,527 |  |  | $ | 70.94 |
Exercised |  |  | (83,096 | ) |  | $ | 34.51 |
Canceled or expired |  |  | — |  |  | $ | — |
Outstanding at December 31, 2013 |  |  | 379,604 |  |  | $ | 55.42 |
Granted |  |  | 75,204 |  |  | $ | 98.91 |
Exercised |  |  | (119,276 | ) |  | $ | 42.07 |
Canceled or expired |  |  | (12,576 | ) |  | $ | 68.89 |
Outstanding at December 31, 2014 |  |  | 322,956 |  |  | $ | 69.95 |
Granted |  |  | 114,894 |  |  | $ | 74.99 |
Exercised |  |  | — |  |  | $ | — |
Canceled or expired |  |  | (7,418 | ) |  | $ | 86.28 |
Outstanding at December 31, 2015 |  |  | 430,432 |  |  | $ | 71.01 |
Under the employee plan, stock options exercisable were 239,518, 157,140 and 175,170 at December 31, 2015, 2014 and 2013, respectively. The following table summarizes information about the Company’s outstanding and exercisable stock options under the employee plan at December 31, 2015:
|  |  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Weighted Average Exercise Price |  |  | Aggregated Intrinsic Value |  | Number Exercisable |  |  | Weighted Average Exercise Price |  |  | Aggregated Intrinsic Value
$ | 31.35 – $36.35 |  |  |  | 16,910 |  |  |  | 1.1 |  |  | $ | 32.82 |  |  |  |  |  | 16,910 |  |  | $ | 32.82 |  |  |
$ | 46.74 |  |  |  | 56,629 |  |  |  | 2.1 |  |  | $ | 46.74 |  |  |  |  |  | 56,629 |  |  | $ | 46.74 |  |  |
$ | 65.28 – $74.99 |  |  |  | 283,963 |  |  |  | 4.6 |  |  | $ | 70.98 |  |  |  |  |  | 141,669 |  |  | $ | 67.90 |  |  |
$ | 93.64 – $96.85 |  |  |  | 35,763 |  |  |  | 5.1 |  |  | $ | 94.27 |  |  |  |  |  | 11,921 |  |  | $ | 94.27 |  |  |
$ | 101.46 – $114.11 |  |  |  | 37,167 |  |  |  | 5.2 |  |  | $ | 103.22 |  |  |  |  |  | 12,389 |  |  | $ | 103.22 |  |  |
$ | 31.35 – $114.11 |  |  |  | 430,432 |  |  |  | 4.2 |  |  | $ | 71.01 |  | $ | 668,000 |  |  | 239,518 |  |  | $ | 63.56 |  | $ | 668,000
The following is a summary of the restricted stock award activity under the employee plan described above for the years ended December 31, 2015, 2014 and 2013:
|  | Unvested Restricted Stock Award Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Nonvested balance at December 31, 2012 |  |  | 418,128 |  |  | $ | 45.39 |
Granted |  |  | 139,971 |  |  | $ | 69.85 |
Vested |  |  | (149,162 | ) |  | $ | 44.30 |
Forfeited |  |  | (9,659 | ) |  | $ | 61.20 |
Nonvested balance at December 31, 2013 |  |  | 399,278 |  |  | $ | 54.92 |
Granted |  |  | 97,706 |  |  | $ | 97.46 |
Vested |  |  | (141,870 | ) |  | $ | 45.64 |
Forfeited |  |  | (33,661 | ) |  | $ | 63.56 |
Nonvested balance at December 31, 2014 |  |  | 321,453 |  |  | $ | 71.04 |
Granted |  |  | 122,740 |  |  | $ | 75.04 |
Vested |  |  | (113,958 | ) |  | $ | 60.73 |
Forfeited |  |  | (18,508 | ) |  | $ | 82.00 |
Nonvested balance at December 31, 2015 |  |  | 311,727 |  |  | $ | 75.73 |
The Company has a stock award plan for nonemployee directors of the Company which provides for the issuance of stock options and restricted stock. The director plan provides for automatic grants of restricted stock to nonemployee directors after each annual meeting of stockholders. In addition, the director plan allows for the issuance of stock options or restricted stock in lieu of cash for all or part of the annual director fee at the option of the director. The exercise prices for all options granted under the plan are equal to the fair market value per share of the Company’s common stock on the date of grant. The terms of the options are ten years. The restricted stock issued after each annual meeting of stockholders vest six months after the date of grant. Options granted and restricted stock issued in lieu of cash director fees vest in equal quarterly increments during the year to which they relate. At December 31, 2015, 539,531 shares were available for future grants under the director plan. The director stock award plan is intended as an incentive to attract and retain qualified independent directors. The following is a summary of the stock option activity under the director plan described above for the years ended December 31, 2015, 2014, and 2013:
|  | Outstanding Non- Qualified or Nonincentive Stock Awards |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2012 |  |  | 345,938 |  |  | $ | 45.84 |
Granted |  |  | 54,958 |  |  | $ | 75.17 |
Exercised |  |  | (80,574 | ) |  | $ | 46.75 |
Outstanding at December 31, 2013 |  |  | 320,322 |  |  | $ | 50.64 |
Granted |  |  | 42,000 |  |  | $ | 99.52 |
Exercised |  |  | (63,988 | ) |  | $ | 39.08 |
Outstanding at December 31, 2014 |  |  | 298,334 |  |  | $ | 60.01 |
Granted |  |  | — |  |  | $ | — |
Exercised |  |  | (77,905 | ) |  | $ | 47.65 |
Outstanding at December 31, 2015 |  |  | 220,429 |  |  | $ | 64.37 |
Under the director plan, options exercisable were 220,429, 298,334 and 320,082 at December 31, 2015, 2014 and 2013, respectively. The following table summarizes information about the Company’s outstanding and exercisable stock options under the director plan at December 31, 2015:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  | Number Exercisable |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value
$29.60 – $36.82 |  |  | 30,000 |  |  |  | 1.9 |  |  | $ | 33.60 |  |  |  |  |  | 30,000 |  |  | $ | 33.60 |  |  |
$41.24 – $56.45 |  |  | 71,276 |  |  |  | 4.3 |  |  | $ | 52.34 |  |  |  |  |  | 71,276 |  |  | $ | 52.34 |  |  |
$61.89 – $62.48 |  |  | 41,153 |  |  |  | 6.5 |  |  | $ | 62.34 |  |  |  |  |  | 41,153 |  |  | $ | 62.34 |  |  |
$75.17 – $99.52 |  |  | 78,000 |  |  |  | 7.3 |  |  | $ | 88.28 |  |  |  |  |  | 78,000 |  |  | $ | 88.28 |  |  |
$29.60 – $99.52 |  |  | 220,429 |  |  |  | 5.4 |  |  | $ | 64.37 |  | $ | 775,000 |  |  | 220,429 |  |  | $ | 64.37 |  | $ | 775,000
The following is a summary of the restricted stock award activity under the director plan described above for the years ended December 31, 2015, 2014 and 2013:
|  | Unvested Restricted Stock Award Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Nonvested balance at December 31, 2012 |  |  | 348 |  |  | $ | 62.99 |
Granted |  |  | 10,536 |  |  | $ | 75.65 |
Vested |  |  | (10,500 | ) |  | $ | 75.23 |
Nonvested balance at December 31, 2013 |  |  | 384 |  |  | $ | 75.65 |
Granted |  |  | 8,160 |  |  | $ | 99.52 |
Vested |  |  | (8,252 | ) |  | $ | 98.41 |
Nonvested balance at December 31, 2014 |  |  | 292 |  |  | $ | 99.52 |
Granted |  |  | 20,350 |  |  | $ | 78.52 |
Vested |  |  | (18,851 | ) |  | $ | 79.77 |
Nonvested balance at December 31, 2015 |  |  | 1,791 |  |  | $ | 68.73 |
The total intrinsic value of all stock options exercised under all of the Company’s plans was $2,555,000, $11,671,000 and $6,703,000 for the years ended December 31, 2015, 2014 and 2013, respectively. The actual tax benefit realized for tax deductions from stock option exercises was $948,000, $4,388,000 and $2,520,000 for the years ended December 31, 2015, 2014 and 2013, respectively. The total intrinsic value of all the restricted stock vestings under all of the Company’s plans was $10,270,000, $14,847,000 and $10,993,000 for the years ended December 31, 2015, 2014 and 2013, respectively. The actual tax benefit realized for tax deductions from restricted stock vestings was $3,810,000, $5,583,000 and $4,133,000 for the years ended December 31, 2015, 2014 and 2013, respectively. As of December 31, 2015, there was $2,956,000 of unrecognized compensation cost related to nonvested stock options and $16,920,000 related to restricted stock. The stock options are expected to be recognized over a weighted average period of approximately 1.2 years and restricted stock over approximately 2.8 years. The total fair value of stock options vested was $2,180,000, $3,759,000 and $3,341,000 during the years ended December 31, 2015, 2014 and 2013, respectively. The fair value of the restricted stock vested was $10,270,000, $14,847,000 and $10,993,000 for the years ended December 31, 2015, 2014 and 2013, respectively. The weighted average per share fair value of stock options granted during the years ended December 31, 2015, 2014 and 2013 was $25.18, $36.05 and $25.14, respectively. The fair value of the stock options granted during the years ended December 31, 2015, 2014 and 2013 was $2,893,000, $4,226,000 and $4,184,000, respectively. The Company currently uses treasury stock shares for restricted stock grants and stock option exercises. The fair value of each stock option was determined using the Black-Scholes option pricing model. The key input variables used in valuing the stock options during the years ended December 31, 2015, 2014 and 2013 were as follows:
|  | 2015 |  |  | 2014 |  |  | 2013 |
Dividend yield |  | None |  |  | None |  |  | None |
Average risk-free interest rate |  |  | 1.3 | % |  |  | 2.0 | % |  |  | 1.1 | %
Stock price volatility |  |  | 33 | % |  |  | 33 | % |  |  | 34 | %
Estimated option term |  |  | Six years |  |  |  | Six years or seven years |  |  |  | Six years or seven years |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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