Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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)

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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-Name Accounting Standards Codification

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Equity Incentive Compensation Plans (Range of Exercise Prices) (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 16, 2013	Dec. 16, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Number of Options	1,330,242	1,330,242
Weighted Average Remaining Contractual Term (Years)	3 years 2 months 16 days
Weighted Average Exercise Price	$ 34.61	$ 34.61	$ 33.71	$ 30.32
Number of Options	1,224,022	1,224,022
Weighted Average Remaining Contractual Term (Years)	2 years 9 months 23 days
Weighted Average Exercise Price	$ 33.18	$ 33.18
Exercise Prices 21.58 to 21.77
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Number of Options	240,000	240,000
Weighted Average Remaining Contractual Term (Years)		10 months 24 days
Weighted Average Exercise Price	$ 21.60	$ 21.60
Number of Options	240,000	240,000
Weighted Average Remaining Contractual Term (Years)		10 months 24 days
Weighted Average Exercise Price	$ 21.60	$ 21.60
Exercise Prices 30.65 to 32.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Number of Options	639,000	639,000
Weighted Average Remaining Contractual Term (Years)		2 years 6 months
Weighted Average Exercise Price	$ 31.70	$ 31.70
Number of Options	639,000	639,000
Weighted Average Remaining Contractual Term (Years)		2 years 6 months
Weighted Average Exercise Price	$ 31.70	$ 31.70
Exercise Prices 38.00 to 53.02
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Number of Options	451,242	451,242
Weighted Average Remaining Contractual Term (Years)		5 years 5 months 4 days
Weighted Average Exercise Price	$ 45.66	$ 45.66
Number of Options	345,022	345,022
Weighted Average Remaining Contractual Term (Years)		4 years 8 months 16 days
Weighted Average Exercise Price	$ 43.98	$ 43.98