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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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

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-Section 50

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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

+ References

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Stock-Based Compensation (Exercise Price Range) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	111,571	139,446	144,370	156,522
Weighted-Average Exercise Price	$ 38.92	$ 53.66	$ 68.90	$ 68.26
Weighted Average Remaining Contractual Life (in years)	6 years 2 months 12 days
Number of Options	73,665	50,997	73,345
Weighted Average Exercise Price	$ 55.89
Under $50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	85,756
Weighted-Average Exercise Price	$ 5.81
Weighted Average Remaining Contractual Life (in years)	7 years 2 months 12 days
Number of Options	47,850
Weighted Average Exercise Price	$ 5.71
$50.01 to $80.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	0
Weighted-Average Exercise Price	$ 0.00
Number of Options	0
Weighted Average Exercise Price	$ 0.00
$80.01 to $120.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	12,200
Weighted-Average Exercise Price	$ 101.30
Weighted Average Remaining Contractual Life (in years)	4 years 2 months 12 days
Number of Options	12,200
Weighted Average Exercise Price	$ 101.30
$120.01 to $160.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	6,882
Weighted-Average Exercise Price	$ 136.86
Weighted Average Remaining Contractual Life (in years)	4 months 24 days
Number of Options	6,882
Weighted Average Exercise Price	$ 136.86
$160.01 to $220.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	2,362
Weighted-Average Exercise Price	$ 207.50
Weighted Average Remaining Contractual Life (in years)	2 years 1 month 6 days
Number of Options	2,362
Weighted Average Exercise Price	$ 207.50
$220.01 to $279.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options	4,371
Weighted-Average Exercise Price	$ 269.01
Weighted Average Remaining Contractual Life (in years)	3 years 1 month 6 days
Number of Options	4,371
Weighted Average Exercise Price	$ 269.01