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Stock-Based Compensation Plans (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock-Based Compensation Plans |  |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
Shares |  |  |
Exercised (in shares) | (131,499) |  |
2009 Plan |  |  |
Stock-Based Compensation Plans |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |
Common stock shares available for grant | 878,622 |  |
2009 Plan | Stock Options |  |  |
Shares |  |  |
Options outstanding at the beginning of the period (in shares) | 249,178 | 340,062 | 501,568
Exercised (in shares) | (71,845) | (90,884) | (157,454)
Granted (in shares) | 0 | 0 | 0
Forfeited (in shares) | 0 | 0 | (4,052)
Options outstanding at the end of the period (in shares) | 177,333 | 249,178 | 340,062
Options exercisable at the end of the period (in shares) | 177,333 | 188,081 | 185,227
Weighted average exercise price per share |  |  |
Options outstanding at the beginning of the period (in dollars per share) | $ 122.17 | $ 122.67 | $ 120.77
Exercised (in dollars per share) | 117.04 | 124.01 | 116.40
Granted (in dollars per share) | 0.00 | 0.00 | 0.00
Forfeited (in dollars per share) | 0.00 | 0.00 | 131.05
Options outstanding at the end of the period (in dollars per share) | 124.25 | 122.17 | 122.67
Options exercisable at the end of the period (in dollars per share) | $ 124.25 | $ 119.98 | $ 116.71
1994 Plan | Stock Options |  |  |
Shares |  |  |
Options outstanding at the beginning of the period (in shares) | 82,195 | 272,402 | 691,526
Exercised (in shares) | (59,654) | (190,207) | (342,743)
Granted (in shares) | 0 | 0 | 0
Forfeited (in shares) | 0 | 0 | (76,381)
Options outstanding at the end of the period (in shares) | 22,541 | 82,195 | 272,402
Options exercisable at the end of the period (in shares) | 22,541 | 82,195 | 272,402
Weighted average exercise price per share |  |  |
Options outstanding at the beginning of the period (in dollars per share) | $ 103.27 | $ 104.96 | $ 106.19
Exercised (in dollars per share) | 112.85 | 105.70 | 99.03
Granted (in dollars per share) | 0.00 | 0.00 | 0.00
Forfeited (in dollars per share) | 0.00 | 0.00 | 142.66
Options outstanding at the end of the period (in dollars per share) | 77.91 | 103.27 | 104.96
Options exercisable at the end of the period (in dollars per share) | $ 77.91 | $ 103.27 | $ 104.96

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + 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 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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