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Stock Incentive Plan (SSAR Activity) (Details) - Stock Appreciation Rights (SARs) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Share Activity |
SSARs outstanding, beginning of period (in shares) | shares | 1,458,611
SSARs granted (in shares) | shares | 286,200
SSARs exercised (in shares) | shares | (670,269)
SSARs canceled or forfeited (in shares) | shares | (14,350)
SSARs outstanding, end of period (in shares) | shares | 1,060,192
Weighted average SSAR exercise prices per share, Granted (in dollars per share) | $ 63.51
Weighted average SSAR exercise prices per share, Exercised (in dollars per share) | 52.04
Weighted average SSAR exercise prices per share, Canceled or forfeited (in dollars per share) | 48.42
Weighted average SSAR exercise prices per share Outstanding at December 31 (in dollars per share) | $ 52.48
Minimum |
Share Activity |
SSAR price ranges per share, Granted (in dollars per share) | 63.47
SSAR price ranges per share, Exercised (in dollars per share) | 32.01
SSAR price ranges per share, Canceled (in dollars per share) | 32.01
Maximum |
Share Activity |
SSAR price ranges per share, Granted (in dollars per share) | 70.41
SSAR price ranges per share, Exercised (in dollars per share) | 55.23
SSAR price ranges per share, Canceled (in dollars per share) | 63.47

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- Definition Number of non-option equity instruments exercised by participants. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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