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CAPITAL STOCK AND STOCK AWARD PLANS (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | A summary of our total compensation expense recognized in our consolidated statements of operations and comprehensive income for stock-based compensation is as follows (in thousands):
| 2017 |  | 2016 |  | 2015
Stock options | $ | 10,109 |  |  | $ | 9,178 |  |  | $ | 14,607 |
Stock awards | 29,217 |  |  | 25,912 |  |  | 40,785 |
Company expense on ESPP discount | 2,479 |  |  | 2,475 |  |  | 2,269 |
Total stock-based compensation expense | $ | 41,805 |  |  | $ | 37,565 |  |  | $ | 57,661 |
Schedule of Share-based Compensation, Stock Options, Activity | The following schedule summarizes stock option activity in the plans. All outstanding unvested options as of December 31, 2017, relate to performance-based grants from 2013 and 2014 and time-based grants from 2015 through 2017.
| Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands) |  | Average Remaining Life (years)
Outstanding at December 31, 2016 | 7,007,923 |  |  | $ | 67.00 |  |  | $ | 43,875 |  |  | 7.7
Grants | 1,452,765 |  |  | 87.11 |  |  |  |  |
Exercised | (388,135 | ) |  | 63.81 |  |  |  |  |
Terminated | (690,481 | ) |  | 62.17 |  |  |  |  |
Outstanding at December 31, 2017 | 7,382,072 |  |  | $ | 71.58 |  |  | $ | 129,295 |  |  | 7.6
Vested at December 31, 2017 | 2,990,514 |  |  | $ | 65.79 |  |  |  |  | 6.3
Exercisable at December 31, 2017 | 2,990,514 |  |  | $ | 65.79 |  |  |  |  | 6.3
Schedule of Intrinsic Value of Options Exercised | Information on the intrinsic value of options exercised is as follows (in thousands):
2017 | $ | 6,026 |
2016 | 981 |
2015 | 400 |
Schedule of Share-based Compensation, Activity | The following table summarizes these unvested stock option grants as of December 31, 2017:
First Vesting Date |  | Last Vesting Date |  | Options Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value |  | Unvested Options
December 31, 2016 |  | December 31, 2020 |  | 1,423,053 |  |  | $ | 12.66 |  |  | 855,984 |
December 31, 2017 |  | December 31, 2021 |  | 1,253,169 |  |  | $ | 12.60 |  |  | 1,003,429 |
December 31, 2018 |  | December 31, 2022 |  | 1,446,070 |  |  | $ | 14.24 |  |  | 1,446,070 |
|  |  |  | 4,122,292 |  |  | $ | 13.20 |  |  | 3,305,483 |
The following table summarizes performance based restricted shares and restricted stock units by vesting period:
First Vesting Date |  | Last Vesting Date |  | Performance Shares and Stock Units Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value (1) |  | Unvested Performance Shares and Restricted Stock Units
December 31, 2014 |  | December 31, 2018 |  | 387,587 |  |  | $ | 46.50 |  |  | 109,784 |
December 31, 2015 |  | December 31, 2019 |  | 329,596 |  |  | 60.80 |  |  | 175,904 |
December 31, 2016 |  | December 31, 2020 |  | 392,990 |  |  | 51.88 |  |  | 309,300 |
December 31, 2017 |  | December 31, 2021 |  | 343,014 |  |  | 64.91 |  |  | 312,142 |
December 31, 2018 |  | December 31, 2022 |  | 308,329 |  |  | 74.19 |  |  | 308,329 |
|  |  |  | 1,761,516 |  |  | $ | 58.71 |  |  | 1,215,459 |
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(1) | Amount shown is the weighted average grant date fair value of performance shares and restricted stock units granted, net of forfeitures.
The following table summarizes performance based options by vesting period:
First Vesting Date |  | Last Vesting Date |  | Options Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value |  | Unvested Options
December 31, 2014 |  | December 31, 2018 |  | 1,412,773 |  |  | 11.83 |  |  | 403,149 |
December 31, 2015 |  | December 31, 2019 |  | 1,271,223 |  |  | 14.17 |  |  | 682,926 |
|  |  |  | 2,683,996 |  |  | $ | 12.94 |  |  | 1,086,075 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value per option was estimated using the Black-Scholes option pricing model with the following assumptions:
| 2017 Grants |  | 2016 Grants |  | 2015 Grants
Risk-free interest rate | 2.27-2.28% |  |  | 2.13-2.14% |  |  | 1.95-1.96% |
Dividend per share (quarterly amounts) | $0.45-0.46 |  |  | $0.43-0.45 |  |  | $0.38-0.43 |
Expected volatility factor | 19.0-21.5% |  |  | 20.0-21.5% |  |  | 22.0-24.0% |
Expected option term | 6.20 years |  |  | 6.26 years |  |  | 6.29 years |
Weighted average fair value per option | $ | 14.23 |  |  | $ | 12.60 |  |  | $ | 12.68 |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes our unvested performance based restricted shares and restricted stock unit grants as of December 31, 2017:
| Number of Shares and Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2016 | 1,245,175 |  |  | $ | 55.90 |
Granted | 310,071 |  |  | 74.14 |
Vested | (121,030 | ) |  | 55.77 |
Forfeitures | (218,757 | ) |  | 49.51 |
Unvested at December 31, 2017 | 1,215,459 |  |  | $ | 61.71 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | The following table summarizes these unvested restricted share and restricted stock unit grants as of December 31, 2017:
| Number of Restricted Shares and Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2016 | 1,240,156 |  |  | $ | 56.70 |
Granted | 280,097 |  |  | 74.17 |
Vested | (386,859 | ) |  | 54.39 |
Forfeitures | (75,944 | ) |  | 56.41 |
Unvested at December 31, 2017 | 1,057,450 |  |  | $ | 62.20 |
Schedule Of Fair Value Stock Awards Vested | A summary of the fair value of full value awards vested (in thousands):
2017 | $ | 29,217 |
2016 | 25,912 |
2015 | 40,785 |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity | The following is a summary of the employee stock purchase plan activity (dollar amounts in thousands):
|  | Shares Purchased By Employees |  | Aggregate Cost to Employees |  | Expense Recognized By the Company
2017 |  | 215,613 |  |  | $ | 14,048 |  |  | $ | 2,479 |
2016 |  | 225,241 |  |  | 14,032 |  |  | 2,475 |
2015 |  | 228,103 |  |  | 13,045 |  |  | 2,269 |
Share Repurchase Program Disclosure | The activity under this authorization is as follows (dollar amounts in thousands):
|  | Shares Repurchased |  | Total Value of Shares Repurchased
2013 Program |  |  |  |
2013 Repurchases |  | 930,075 |  |  | $ | 57,689 |
2014 Repurchases |  | 3,763,583 |  |  | 239,037 |
2015 Repurchases |  | 3,420,681 |  |  | 232,113 |
2016 Repurchases |  | 2,467,097 |  |  | 176,676 |
2017 Repurchases |  | 2,426,407 |  |  | 179,985 |

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