v3.3.1.900

Stock-Based Compensation - Stock Incentive Plans (Details) - shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class A common stock |  |  |  |
Stock-Based Compensation |  |  |  |
Number of common stock available for future grant under stock incentive plans (in shares) | 4,300,000 |  |  |
Restricted stock units |  |  |  |
Stock-Based Compensation |  |  |  |
Restricted stock units (in shares) | 57,328 | 96,768 | 121,877 | 151,683
Stock options |  |  |  |
Stock-Based Compensation |  |  |  |
Stock options (in shares) | 5,893,241 | 6,669,614 | 6,271,058 | 7,908,300
Stock options | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Vesting period | 3 years |  |  |
Stock options | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration term | 10 years |  |  |
Vesting period | 5 years |  |  |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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