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Stock-based Compensation | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation |
6. | STOCK-BASED COMPENSATION
Restricted Stock Unit Awards Along with cash-based salaries and performance-based annual cash incentive awards, restricted stock unit awards represent an important element of compensation to our employees. 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, 2017 | 785.7 |  |  | $ | 117.62 |  | 1.82
Granted | 11.1 |  |  | 118.00 |  |
Vested | (3.3 | ) |  | 117.81 |  |
Forfeited | (17.6 | ) |  | 112.71 |  |
Unvested as of June 30, 2017 | 775.9 |  |  | $ | 117.74 |  | 1.61
Unvested shares expected to vest as of June 30, 2017 | 775.9 |  |  | $ | 117.74 |  | 1.61
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
| Shares (thousands) |  | Weighted Average Grant Date Fair Value | Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2016 | 750.9 |  |  | $ | 113.97 |  | 1.71
Granted | 151.9 |  |  | 116.54 |  |
Vested | (106.4 | ) |  | 90.32 |  |
Forfeited | (20.5 | ) |  | 113.16 |  |
Unvested as of June 30, 2017 | 775.9 |  |  | $ | 117.74 |  | 1.61
Unvested shares expected to vest as of June 30, 2017 | 775.9 |  |  | $ | 117.74 |  | 1.61
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
We determine the fair value of restricted stock units based on the closing market price of the Company's common stock on the grant date. As of June 30, 2017, we had $30.7 million of unamortized deferred compensation related to unvested restricted stock units, which we anticipate recognizing over varying periods into 2020.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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