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Stock-Based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of Options |  |  |  |
Outstanding at beginning of the year |  | 650 | 924 | 1,412
Granted |  | 77 | 133 | 201
Exercised |  | (71) | (391) | (679)
Forfeited/canceled/expired |  | (8) | (16) | (10)
Outstanding at end of the year |  | 648 | 650 | 924
Vested and expected to vest at the end of the year |  | 648 | 649 | 921
Exercisable at the end of the year |  | 493 | 421 | 671
Weighted-Average Exercise Price |  |  |  |
Outstanding at beginning of the year |  | $ 25.56 | $ 22.04 | $ 20.56
Granted |  | 64.81 | 35.28 | 19.68
Exercised |  | 23.97 | 20.76 | 18.22
Forfeited/canceled/expired |  | 20.64 | 20.77 | 24.75
Outstanding at end of the year |  | 30.50 | 25.56 | 22.04
Vested and expected to vest at the end of the year |  | 30.50 | 25.57 | 22.05
Exercisable at the end of the year |  | $ 25.03 | $ 23.84 | $ 22.62
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value |  |  |  |
Outstanding at beginning of the year |  | 4 years 10 months 5 days | 5 years 7 months 2 days | 6 years 1 month 3 days
Vested and expected to vest at the end of the year |  | 4 years 10 months 5 days | 5 years 6 months 28 days | 6 years 28 days
Exercisable at the end of the year |  | 4 years 6 months 3 days | 4 years 10 months 13 days | 5 years 1 month 20 days
Exercised |  | $ 2,193 | $ 10,651 | $ 8,355
Outstanding at end of the year | [1] | 14,556 | 25,653 | 14,854
Vested and expected to vest at the end of the year | [1] | 14,551 | 25,618 | 14,791
Exercisable at the end of the year | [1] | $ 12,979 | $ 17,345 | $ 10,388
[1] | The aggregate intrinsic value represents the total pre-tax value (the difference between our closing stock price on the last trading day of 2015, 2014, and 2013 and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had they all exercised their options on December 31, 2015, 2014, and 2013. This amount will change based on the fair market value of our stock.

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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 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 -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 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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -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 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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