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Equity Incentive Plans Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Stock options outstanding, shares |  | 3,765,952 | 5,207,772 | 6,832,331 | 9,355,070
Stock options exercised, shares |  | (1,425,075) | (1,687,700) | (2,399,419) |
Stock options forfeited/canceled, shares |  | (16,745) | (63,614) | (123,320) |
Stock options granted, shares |  |  | 126,755 |  |
Exercisable stock options, shares |  | 3,673,816 |  |  |
Exercisable and expected to vest stock options, shares |  | 3,756,738 |  |  |
Stock options outstanding, weighted average exercise price |  | $ 8.63 | $ 8.04 | $ 7.04 | $ 6.90
Stock options exercised, weighted average exercise price |  | 6.22 | 5.52 | 6.41 |
Stock options forfeited/canceled, weighted average exercise price |  | 28.12 | 16.10 | $ 8.89 |
Stock options granted, weighted average exercise price |  |  | $ 32.31 |  |
Exercisable stock options, weighted average exercise price |  | 8.04 |  |  |
Exercisable and expected to vest stock options, weighted average exercise price |  | $ 8.58 |  |  |
Stock options outstanding, weighted average remaining contractual term (years) | 2 years 11 months |  |  |  |
Exercisable stock options, weighted average remaining contractual term (years) | 2 years 11 months |  |  |  |
Exercisable and expected to vest stock options, weighted average remaining contractual term (years) | 2 years 11 months |  |  |  |
Stock options outstanding, aggregate intrinsic value |  | $ 79,317 |  |  |
Exercisable stock options, aggregate intrinsic value |  | 79,317 |  |  |
Exercisable and expected to vest stock options, aggregate intrinsic value |  | 79,317 |  |  |
Stock Options |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |
Stock options exercised, aggregate intrinsic value |  | $ 32,375 | $ 38,373 | $ 46,899 |

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- Definition 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. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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 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 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 -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 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 As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + 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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