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Stock-Based Compensation Plans | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Plans | Stock-Based Compensation Plans As part of its long term compensation plans, the Company has granted stock options, performance awards and restricted stock. Detail of the outstanding awards and activity is presented below. Information with respect to stock options granted under the Company’s 1994 Stock Option and Incentive Plan (the “1994 Plan”) and its 2009 Stock Option and Incentive Plan (the “2009 Plan”) is as follows:
|  | 2009 Plan shares |  | Weighted average exercise price per share |  | 1994 Plan shares |  | Weighted average exercise price per share
Options Outstanding, December 31, 2015 |  | 249,178 |  |  | $ | 122.17 |  |  | 82,195 |  |  | $ | 103.27 |
Exercised |  | (68,538 | ) |  | 116.37 |  |  | (59,654 | ) |  | 112.85 |
Forfeited |  | — |  |  | — |  |  | — |  |  | — |
Options Outstanding, September 30, 2016 (1) |  | 180,640 |  |  | $ | 124.37 |  |  | 22,541 |  |  | $ | 77.91 |
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(1) | All options outstanding are exercisable as of September 30, 2016.
Information with respect to performance awards granted is as follows:
|  | Performance awards |  | Weighted average grant date fair value per award
Outstanding at December 31, 2015 |  | 238,266 |  |  | $ | 119.65 |
Granted (1) |  | 94,054 |  |  | 141.92 |
Change in units based on performance (2) |  | 36,091 |  |  | 101.52 |
Converted to restricted stock |  | (115,618 | ) |  | 94.67 |
Forfeited |  | (1,630 | ) |  | 141.98 |
Outstanding at September 30, 2016 |  | 251,163 |  |  | $ | 136.74 |
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(1) | The amount of restricted stock that ultimately may be earned is based on the total shareholder return metrics related to the Company’s common stock for 61,039 performance awards and financial metrics related to operating performance and leverage metrics of the Company for 33,015 performance awards.
(2) | Represents the change in the number of performance awards earned based on performance achievement.
The Company used a Monte Carlo model to assess the compensation cost associated with the portion of the performance awards determined by using total shareholder return measures. The assumptions used are as follows:
|  | 2016
Dividend yield |  | 3.3%
Estimated volatility over the life of the plan (1) |  | 15.2% - 22.8%
Risk free rate |  | 0.44% - 0.88%
Estimated performance award value based on total shareholder return measure |  | $131.24
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(1) | Estimated volatility over the life of the plan is using 50% historical volatility and 50% implied volatility.
For the portion of the performance awards granted in 2016, for which achievement will be determined by using financial metrics, the compensation cost was based on a weighted average grant date value of $161.66, and the Company's estimate of corporate achievement for the financial metrics. Information with respect to restricted stock granted is as follows:
|  | Restricted stock shares |  | Restricted stock shares weighted average grant date fair value per share |  | Restricted stock shares converted from performance awards
Outstanding at December 31, 2015 |  | 147,884 |  |  | $ | 146.21 |  |  | 98,347 |
Granted - restricted stock shares |  | 80,873 |  |  | 162.34 |  |  | 115,618 |
Vested - restricted stock shares |  | (84,623 | ) |  | 141.49 |  |  | (36,872 | )
Forfeited |  | (3,453 | ) |  | 162.34 |  |  | (395 | )
Outstanding at September 30, 2016 |  | 140,681 |  |  | $ | 157.49 |  |  | 176,698 |
Total employee stock-based compensation cost recognized in income was $11,555,000 and $11,255,000 for the nine months ended September 30, 2016 and 2015, respectively, and total capitalized stock-based compensation cost was $7,790,000 and $7,738,000 for the nine months ended September 30, 2016 and 2015, respectively. At September 30, 2016, there was a total unrecognized compensation cost of $28,890,000 for unvested restricted stock and performance awards, which does not include estimated forfeitures, and is expected to be recognized over a weighted average period of 3.6 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=65895303&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=68057994&loc=d3e25284-112666 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: 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 6: 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 + Details
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