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Stock Incentive Plan (SSAR Activity) (Details) - Stock Appreciation Rights (SARs)	12 Months Ended
	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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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

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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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