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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Restricted Stock Unit Activity | Restricted stock unit activity is presented in the following tables.
| Shares (thousands) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of March 31, 2016 | 820.4 |  |  | $ | 112.83 |  | 2.21
Granted | 49.7 |  |  | 108.75 |  |
Vested | (9.7 | ) |  | 92.60 |  |
Forfeited | (43.1 | ) |  | 117.52 |  |
Unvested as of June 30, 2016 | 817.3 |  |  | $ | 112.58 |  | 2.00
Unvested shares expected to vest as of June 30, 2016 | 796.1 |  |  | $ | 112.69 |  | 2.00
Unvested as of March 31, 2015 | 819.6 |  |  | $ | 101.13 |  | 2.35
Granted | 10.2 |  |  | 172.93 |  |
Vested | (14.3 | ) |  | 85.82 |  |
Forfeited | (6.5 | ) |  | 87.58 |  |
Unvested as of June 30, 2015 | 809.0 |  |  | $ | 102.41 |  | 2.15
Unvested shares expected to vest as of June 30, 2015 | 785.9 |  |  | $ | 102.62 |  | 2.16
| Shares (thousands) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2015 | 706.0 |  |  | $ | 111.78 |  | 2.03
Granted | 250.6 |  |  | 107.45 |  |
Vested | (94.6 | ) |  | 91.22 |  |
Forfeited | (44.7 | ) |  | 116.50 |  |
Unvested as of June 30, 2016 | 817.3 |  |  | $ | 112.58 |  | 1.99
Unvested shares expected to vest as of June 30, 2016 | 796.1 |  |  | $ | 112.69 |  | 2.00
Unvested as of December 31, 2014 | 745.3 |  |  | $ | 90.43 |  | 2.38
Granted | 130.3 |  |  | 160.91 |  |
Vested | (56.1 | ) |  | 81.94 |  |
Forfeited | (10.5 | ) |  | 88.16 |  |
Unvested as of June 30, 2015 | 809.0 |  |  | $ | 102.41 |  | 2.15
Unvested shares expected to vest as of June 30, 2015 | 785.9 |  |  | $ | 102.62 |  | 2.16

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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