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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Activity in Stock Option Awards | A summary of the activity in the stock option awards for the last three years is presented below.
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |  |  | Shares |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 5,779,597 |  |  | $ | 4.53 |  |  |  | 8,602,626 |  |  | $ | 4.53 |  |  |  | 22,702,534 |  |  | $ | 4.48 |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited |  |  | (108,818 | ) |  |  | 5.04 |  |  |  | (574,967 | ) |  |  | 9.29 |  |  |  | (1,323,664 | ) |  |  | 10.46 |
Exercised |  |  | (1,614,243 | ) |  |  | 1.89 |  |  |  | (2,248,062 | ) |  |  | 3.34 |  |  |  | (12,776,244 | ) |  |  | 3.83 |
Outstanding at end of year |  |  | 4,056,536 |  |  | $ | 5.56 |  |  |  | 5,779,597 |  |  | $ | 4.53 |  |  |  | 8,602,626 |  |  | $ | 4.53 |
Summary of Information About Stock Options Outstanding and Exercisable | The following table summarizes information about stock options outstanding and exercisable at December 31, 2016.
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price |
$0.83—$3.00 |  |  | 183,862 |  |  |  | 1.71 |  |  |  | 1.64 |  |  |  | 183,862 |  |  |  | 1.71 |  |  |  | 1.64 |
3.01—5.12 |  |  | 569,901 |  |  |  | 1.02 |  |  |  | 4.34 |  |  |  | 569,901 |  |  |  | 1.02 |  |  |  | 4.34 |
5.13 |  |  | 183,993 |  |  |  | 0.43 |  |  |  | 5.13 |  |  |  | 183,993 |  |  |  | 0.43 |  |  |  | 5.13 |
5.14—8.00 |  |  | 2,806,280 |  |  |  | 5.05 |  |  |  | 5.64 |  |  |  | 2,806,280 |  |  |  | 5.05 |  |  |  | 5.64 |
8.01—11.27 |  |  | 312,500 |  |  |  | 0.18 |  |  |  | 9.64 |  |  |  | 312,500 |  |  |  | 0.18 |  |  |  | 9.64 |
$0.83—$11.27 |  |  | 4,056,536 |  |  |  | 3.76 |  |  |  | 5.56 |  |  |  | 4,056,536 |  |  |  | 3.76 |  |  |  | 5.56 |
Summary of Status of Company's Nonvested Shares | A summary of the status of the Company’s nonvested shares and changes during 2016, 2015 and 2014 is presented below.
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | Shares |  |  | Weighted Average Grant- Date Price |  |  | Shares |  |  | Weighted Average Grant- Date Price |  |  | Shares |  |  | Weighted Average Grant- Date Price |
Outstanding at beginning of year |  |  | 9,588,889 |  |  | $ | 6.07 |  |  |  | 10,708,372 |  |  | $ | 4.65 |  |  |  | 10,207,546 |  |  | $ | 4.76 |
Granted |  |  | 10,099,481 |  |  |  | 3.53 |  |  |  | 2,886,640 |  |  |  | 9.43 |  |  |  | 5,809,821 |  |  |  | 4.33 |
Vested |  |  | (3,521,765 | ) |  |  | 5.31 |  |  |  | (3,370,569 | ) |  |  | 4.46 |  |  |  | (4,179,789 | ) |  |  | 4.75 |
Forfeited |  |  | (3,418,814 | ) |  |  | 4.51 |  |  |  | (635,554 | ) |  |  | 5.94 |  |  |  | (1,129,206 | ) |  |  | 3.65 |
Outstanding at end of year |  |  | 12,747,791 |  |  | $ | 4.41 |  |  |  | 9,588,889 |  |  | $ | 6.07 |  |  |  | 10,708,372 |  |  | $ | 4.65 |
Summary of Performance Based Long Term Incentive Program | A summary of the activity in the performance-based long-term incentive program since inception is presented below.
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | Shares |  |  | Weighted Average Grant- Date Price |  |  | Shares |  |  | Weighted Average Grant- Date Price |  |  | Shares |  |  | Weighted Average Grant- Date Price |
Outstanding at beginning of the year |  |  | 8,589,114 |  |  | $ | 5.95 |  |  |  | 6,808,964 |  |  | $ | 4.43 |  |  |  | 3,076,292 |  |  | $ | 4.45 |
Granted |  |  | 9,635,184 |  |  |  | 3.37 |  |  |  | 2,745,303 |  |  |  | 9.45 |  |  |  | 5,289,047 |  |  |  | 4.55 |
Vested |  |  | (161,408 | ) |  |  | 4.32 |  |  |  | (283,244 | ) |  |  | 3.98 |  |  |  | (1,246,006 | ) |  |  | 3.74 |
Forfeited |  |  | (4,320,506 | ) |  |  | 5.69 |  |  |  | (681,909 | ) |  |  | 5.67 |  |  |  | (310,369 | ) |  |  | 4.16 |
Outstanding at end of the year |  |  | 13,742,384 |  |  |  | 4.66 |  |  |  | 8,589,114 |  |  | $ | 5.95 |  |  |  | 6,808,964 |  |  | $ | 4.43 |

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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