Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

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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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Stock-Based Compensation Plans (Details 2) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Intrinsic value of options exercised	$ 18,080	$ 20,028	$ 2,395
2009 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding intrinsic value	15,438
Options exercisable intrinsic value	$ 12,066
Options exercisable weighted average contractual life (in years)	6 years 3 months 18 days
2009 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	249,178
1994 Plan
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding intrinsic value	$ 6,647
Options exercisable intrinsic value	$ 6,647
Options exercisable weighted average contractual life (in years)	1 year 8 months 12 days
1994 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	82,195
40.00 - 49.99 \| 1994 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	9,854
Exercise Price, lower limit (in dollars per share)	$ 40.00
Exercise Price, upper limit (in dollars per share)	$ 49.99
Weighted Average Remaining Contractual Term	3 years 1 month 6 days
70.00 - 79.99 \| 2009 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	25,622
Exercise Price, lower limit (in dollars per share)	$ 70.00
Exercise Price, upper limit (in dollars per share)	$ 79.99
Weighted Average Remaining Contractual Term	4 years 1 month 6 days
80.00 - 89.99 \| 1994 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	35,511
Exercise Price, lower limit (in dollars per share)	$ 80.00
Exercise Price, upper limit (in dollars per share)	$ 89.99
Weighted Average Remaining Contractual Term	2 years 1 month 6 days
90.00 - 99.99 \| 1994 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	7,174
Exercise Price, lower limit (in dollars per share)	$ 90.00
Exercise Price, upper limit (in dollars per share)	$ 99.99
Weighted Average Remaining Contractual Term	1 month 6 days
110.00 - 119.99 \| 2009 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	38,326
Exercise Price, lower limit (in dollars per share)	$ 110.00
Exercise Price, upper limit (in dollars per share)	$ 119.99
Weighted Average Remaining Contractual Term	5 years 1 month 6 days
120.00 - 129.99 \| 2009 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	44,135
Exercise Price, lower limit (in dollars per share)	$ 120.00
Exercise Price, upper limit (in dollars per share)	$ 129.99
Weighted Average Remaining Contractual Term	7 years 2 months 12 days
130.00 - 139.99 \| 2009 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	141,095
Exercise Price, lower limit (in dollars per share)	$ 130.00
Exercise Price, upper limit (in dollars per share)	$ 139.99
Weighted Average Remaining Contractual Term	6 years 7 months 6 days
140.00 - 149.99 \| 1994 Plan \| Stock Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options (in shares)	29,656
Exercise Price, lower limit (in dollars per share)	$ 140.00
Exercise Price, upper limit (in dollars per share)	$ 149.99
Weighted Average Remaining Contractual Term	1 year 1 month 6 days