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Stock-Based Compensation Plans (Details) | 9 Months Ended
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Sep. 30, 2016 $ / shares shares
Shares |
Exercised (in shares) | (128,192)
2009 Plan | Stock Options |
Shares |
Options outstanding at the beginning of the period (in shares) | 249,178
Exercised (in shares) | (68,538)
Forfeited (in shares) | 0
Options outstanding at the end of the period (in shares) | 180,640
Weighted average exercise price per share |
Options outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 122.17
Exercised (in dollars per share) | $ / shares | 116.37
Forfeited (in dollars per share) | $ / shares | 0.00
Options outstanding at the end of the period (in dollars per share) | $ / shares | $ 124.37
1994 Plan | Stock Options |
Shares |
Options outstanding at the beginning of the period (in shares) | 82,195
Exercised (in shares) | (59,654)
Forfeited (in shares) | 0
Options outstanding at the end of the period (in shares) | 22,541
Weighted average exercise price per share |
Options outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 103.27
Exercised (in dollars per share) | $ / shares | 112.85
Forfeited (in dollars per share) | $ / shares | 0.00
Options outstanding at the end of the period (in dollars per share) | $ / shares | $ 77.91

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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