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Stock-based Compensation | 3 Months Ended
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Mar. 31, 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 our compensation program. 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 December 31, 2016 | 750.9 |  |  | $ | 113.97 |  | 1.71
Granted | 140.9 |  |  | 116.42 |  |
Vested | (103.2 | ) |  | 89.44 |  |
Forfeited | (2.9 | ) |  | 115.93 |  |
Unvested as of March 31, 2017 | 785.7 |  |  | 117.62 |  | 1.82
Unvested shares expected to vest as of March 31, 2017 | 785.7 |  |  | $ | 117.62 |  | 1.82
Unvested as of December 31, 2015 | 706.0 |  |  | $ | 111.78 |  | 2.03
Granted | 200.8 |  |  | 107.12 |  |
Vested | (84.9 | ) |  | 91.06 |  |
Forfeited | (1.5 | ) |  | 87.86 |  |
Unvested as of March 31, 2016 | 820.4 |  |  | $ | 112.83 |  | 2.21
Unvested shares expected to vest as of March 31, 2016 | 799.0 |  |  | $ | 112.97 |  | 2.22
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 March 31, 2017, we had $33.5 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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