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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Costs Related to Stock Compensation Plans | The following costs related to the Company’s stock compensation plans were included in the condensed consolidated statements of income and comprehensive income:
| Three Months Ended March 31,
| 2017 |  | 2016
Cost of revenues | $ | 5,350 |  |  | $ | 3,644 |
Selling, general and administrative expenses - Acquisition related | 4,574 |  |  | 3,010 |
Selling, general and administrative expenses - All other | 5,852 |  |  | 4,310 |
Total | $ | 15,776 |  |  | $ | 10,964 |
Stock Option Activity | Stock option activity under the Company’s plans is set forth below:
| Number of Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Options outstanding at January 1, 2017 | 6,637,239 |  |  | $ | 37.20 |  |  | $ | 179,936 |
Options granted | 234,990 |  |  | 73.27 |  |  | 529 |
Options exercised | (486,524 | ) |  | 27.92 |  |  | (23,159 | )
Options forfeited/cancelled | (75,456 | ) |  | 57.87 |  |  | (1,332 | )
Options outstanding at March 31, 2017 | 6,310,249 |  |  | $ | 39.06 |  |  | $ | 230,072 |
Options vested and exercisable at March 31, 2017 | 4,302,714 |  |  | $ | 30.84 |  |  | $ | 192,245 |
Options expected to vest | 1,891,705 |  |  | $ | 56.33 |  |  | $ | 36,302 |
Service-based Awards Activity | The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the three months ended March 31, 2017.
| Equity-Classified Restricted Stock |  | Equity-Classified Equity-Settled Restricted Stock Units |  | Liability-Classified Cash-Settled Restricted Stock Units
| Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested service-based awards outstanding at January 1, 2017 | 154,125 |  |  | $ | 40.89 |  |  | 485,188 |  |  | $ | 67.69 |  |  | 204,501 |  |  | $ | 70.53 |
Awards granted | — |  |  | — |  |  | 380,577 |  |  | 73.27 |  |  | 138,584 |  |  | 73.27 |
Awards modified | — |  |  | — |  |  | (2,570 | ) |  | 48.49 |  |  | 2,570 |  |  | 73.27 |
Awards vested | (1,437 | ) |  | 20.64 |  |  | (116,183 | ) |  | 65.32 |  |  | (51,928 | ) |  | 70.56 |
Awards forfeited/cancelled | — |  |  | — |  |  | (19,036 | ) |  | 67.45 |  |  | (616 | ) |  | 70.52 |
Unvested service-based awards outstanding at March 31, 2017 | 152,688 |  |  | $ | 41.08 |  |  | 727,976 |  |  | $ | 71.06 |  |  | 293,111 |  |  | $ | 71.84 |
Performance-based Awards Activity | Summarized activity related to the Company’s performance-based awards for the three months ended March 31, 2017, was as follows:
| Equity-Classified Restricted Stock |  | Liability-Classified Restricted Stock |  | Equity-Classified Equity-Settled Restricted Stock Units
| Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Unvested performance-based awards outstanding at January 1, 2017 | 5,573 |  |  | $ | 33.47 |  |  | 105,602 |  |  | $ | 38.86 |  |  | 4,667 |  |  | $ | 70.22 |
Awards granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Awards vested | (2,552 | ) |  | 36.57 |  |  | — |  |  | — |  |  | — |  |  | — |
Awards forfeited/cancelled | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Unvested performance-based awards outstanding at March 31, 2017 | 3,021 |  |  | $ | 30.85 |  |  | 105,602 |  |  | $ | 38.86 |  |  | 4,667 |  |  | $ | 70.22 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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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