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Stock-Based Compensation Plans (Details) | 9 Months Ended
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Sep. 30, 2015 $ / shares shares
Shares |
Exercised (in shares) | (155,173)
2009 Plan | Stock Options |
Shares |
Options outstanding at the beginning of the period (in shares) | 340,062
Exercised (in shares) | (54,719)
Forfeited (in shares) | 0
Options outstanding at the end of the period (in shares) | 285,343
Options exercisable at the end of the period (in shares) | 224,246
Weighted average exercise price per share |
Options outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 122.67
Exercised (in dollars per share) | $ / shares | 121.70
Forfeited (in dollars per share) | $ / shares | 0.00
Options outstanding at the end of the period (in dollars per share) | $ / shares | 122.85
Options exercisable at the end of the period (in dollars per share) | $ / shares | $ 121.19
1994 Plan | Stock Options |
Shares |
Options outstanding at the beginning of the period (in shares) | 272,402
Exercised (in shares) | (100,454)
Forfeited (in shares) | 0
Options outstanding at the end of the period (in shares) | 171,948
Options exercisable at the end of the period (in shares) | 171,948
Weighted average exercise price per share |
Options outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 104.96
Exercised (in dollars per share) | $ / shares | 90.82
Forfeited (in dollars per share) | $ / shares | 0.00
Options outstanding at the end of the period (in dollars per share) | $ / shares | 113.23
Options exercisable at the end of the period (in dollars per share) | $ / shares | $ 113.23

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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