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CAPITAL STOCK AND STOCK AWARD PLANS (Tables) | 12 Months Ended
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Dec. 31, 2016
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):
| 2016 |  | 2015 |  | 2014
Stock options | $ | 9,178 |  |  | $ | 14,607 |  |  | $ | 9,243 |
Stock awards | 25,912 |  |  | 40,785 |  |  | 36,510 |
Company expense on ESPP discount | 2,475 |  |  | 2,269 |  |  | 2,108 |
Total stock-based compensation expense | $ | 37,565 |  |  | $ | 57,661 |  |  | $ | 47,861 |
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, 2016, relate to the performance-based grants from 2011 through 2016.
| Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands) |  | Average Remaining Life (years)
Outstanding at December 31, 2015 | 6,150,861 |  |  | $ | 65.03 |  |  | $ | — |  |  | 8.1
Grants | 1,250,154 |  |  | 76.72 |  |  |  |  |
Exercised | (86,840 | ) |  | 61.82 |  |  |  |  |
Terminated | (306,252 | ) |  | 68.81 |  |  |  |  |
Outstanding at December 31, 2016 | 7,007,923 |  |  | $ | 67.00 |  |  | $ | 43,875 |  |  | 7.7
Vested at December 31, 2016 | 2,646,205 |  |  | $ | 64.63 |  |  |  |  | 6.7
Exercisable at December 31, 2016 | 2,646,205 |  |  | $ | 64.63 |  |  |  |  | 6.7
Schedule of Intrinsic Value of Options Exercised | Information on the intrinsic value of options exercised is as follows (in thousands):
2016 | $ | 981 |
2015 | 400 |
2014 | 4 |
Schedule of Share-based Compensation, Activity | The following table summarizes these unvested stock option grants as of December 31, 2016:
Year of Grant |  | First Vesting Date |  | Last Vesting Date |  | Options Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value |  | Unvested Options
2015 |  | December 31, 2016 |  | December 31, 2020 |  | 1,428,531 |  |  | $ | 12.66 |  |  | 1,142,825 |
2016 |  | December 31, 2017 |  | December 31, 2021 |  | 1,250,154 |  |  | 12.60 |  |  | 1,250,154 |
|  |  |  |  |  | 2,678,685 |  |  | $ | 12.63 |  |  | 2,392,979 |
The following table summarizes performance-based options by year of grant:
Year of Grant |  | First Vesting Date |  | Last Vesting Date |  | Options Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value |  | Unvested Options
2012 |  | December 31, 2013 |  | December 31, 2017 |  | 1,149,441 |  |  | $ | 13.15 |  |  | 666,676 |
2013 |  | December 31, 2014 |  | December 31, 2018 |  | 1,425,529 |  |  | 11.83 |  |  | 541,701 |
2014 |  | December 31, 2015 |  | December 31, 2019 |  | 1,277,409 |  |  | 14.17 |  |  | 804,595 |
|  |  |  |  |  | 3,852,379 |  |  | $ | 13.00 |  |  | 2,012,972 |
The following table summarizes performance shares and restricted stock units by year of grant:
Year of grant |  | 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
2012 |  | December 31, 2013 |  | December 31, 2017 |  | 325,536 |  |  | $ | 48.65 |  |  | 188,811 |
2013 |  | December 31, 2014 |  | December 31, 2018 |  | 394,672 |  |  | 46.50 |  |  | 149,975 |
2014 |  | December 31, 2015 |  | December 31, 2019 |  | 336,683 |  |  | 60.57 |  |  | 212,110 |
2015 |  | December 31, 2016 |  | December 31, 2020 |  | 390,163 |  |  | 51.88 |  |  | 343,342 |
2016 |  | December 31, 2017 |  | December 31, 2021 |  | 350,937 |  |  | 64.91 |  |  | 350,937 |
|  |  |  |  |  | 1,797,991 |  |  | $ | 54.29 |  |  | 1,245,175 |
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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.
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:
| 2016 Grants |  | 2015 Grants |  | 2014 Grants
Risk-free interest rate | 2.13-2.14% |  |  | 1.95-1.96% |  |  | 1.93-1.96% |
Dividend per share (quarterly amounts) | $0.43-0.45 |  |  | $0.38-0.43 |  |  | $0.35-0.38 |
Expected volatility factor | 20.0-21.5% |  |  | 22.0-24.0% |  |  | 22.0-25.0% |
Expected option term | 6.26 years |  |  | 6.29 years |  |  | 6.3 years |
Weighted average fair value per option | $ | 12.60 |  |  | $ | 12.68 |  |  | $ | 14.23 |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes our unvested performance shares and restricted stock unit grants as of December 31, 2016:
| Number of Performance Shares and Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2015 | 1,272,040 |  |  | $ | 52.56 |
Granted | 350,937 |  |  | 64.91 |
Vested | (175,413 | ) |  | 52.40 |
Forfeitures | (202,389 | ) |  | 53.61 |
Unvested at December 31, 2016 | 1,245,175 |  |  | $ | 55.90 |
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, 2016:
| Number of Restricted Shares and Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2015 | 1,127,522 |  |  | $ | 52.69 |
Granted | 464,823 |  |  | 63.02 |
Vested | (291,525 | ) |  | 52.01 |
Forfeitures | (60,664 | ) |  | 53.06 |
Unvested at December 31, 2016 | 1,240,156 |  |  | $ | 56.70 |
Schedule Of Fair Value Stock Awards Vested | A summary of the fair value of full value awards vested (in thousands):
2016 | $ | 25,912 |
2015 | 40,785 |
2014 | 36,510 |
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
2016 |  | 225,241 |  |  | $ | 14,032 |  |  | $ | 2,475 |
2015 |  | 228,103 |  |  | 13,045 |  |  | 2,269 |
2014 |  | 231,564 |  |  | 11,943 |  |  | 2,108 |
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 Purchases |  | 930,075 |  |  | $ | 57,689 |
2014 Purchases |  | 3,763,583 |  |  | 239,037 |
2015 Purchases |  | 3,420,681 |  |  | 232,113 |
2016 Purchases |  | 2,467,097 |  |  | 176,676 |

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