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Share Based Award Share based compensation (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options, Outstanding, Number | 2,379,407 | 2,556,936
Options, Outstanding, Weighted Average Exercise Price | $ 56.90 | $ 49.46
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 7 years 1 month |
Options, Outstanding, Intrinsic Value | $ 132,963 |
Options, Grants in Period, Gross | 267,641 |
Options, Grants in Period, Weighted Average Exercise Price | $ 92.00 |
Options, Exercises in Period | (435,146) |
Options, Exercises in Period, Weighted Average Exercise Price | $ 34.77 |
Options, Nonvested Options Forfeited, Number of Shares | (10,024) |
Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value | $ 58.20 |
Options, Vested, Number of Shares | 1,287,271 |
Exercise Price Range, Exercisable Options, Weighted Average Exercise Price | $ 48.45 |
Options, Exercisable, Weighted Average Remaining Contractual Term | 5 years 11 months |
Options, Exercisable, Intrinsic Value | $ 82,809 |
Options, Vested and Expected to Vest, Exercisable, Number | 2,379,407 |
Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 56.90 |
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term | 7 years 1 month |
Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ 132,963 |

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- Definition 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. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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