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CAPITAL STOCK AND STOCK AWARD PLANS (Tables)
12 Months Ended
Dec. 31, 2015
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):
 
2015
 
2014
 
2013
Stock options
$
14,607

 
$
9,243

 
$
5

Stock awards
40,785

 
36,510

 
6,808

Company expense on ESPP discount
2,269

 
2,108

 
2,281

Total stock-based compensation expense
$
57,661

 
$
47,861

 
$
9,094

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, 2015, relate to the performance-based grants from 2011 through 2015. 
 
Options
 
Weighted
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
(in thousands)
 
Average
Remaining
Life
(years)
Outstanding at December 31, 2014
4,704,620

 
$
65.40

 
$
44,644

 
8.1
Grants
1,493,388

 
63.80

 


 

Exercised
(40,337
)
 
62.30

 


 

Terminated
(6,810
)
 
66.99

 


 

Outstanding at December 31, 2015
6,150,861

 
$
65.03

 
$

 
8.1
 
 
 
 
 
 
 
 
Vested at December 31, 2015
1,991,263

 
$
64.49

 
$

 
7.3
Exercisable at December 31, 2015
1,991,263

 
$
64.49

 
$

 
7.3
Schedule of Intrinsic Value of Options Exercised
Information on the intrinsic value of options exercised is as follows (in thousands):
2015
$
400

2014
4

2013
7,640

Schedule of Share-based Compensation, Activity
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
2011
 
December 31, 2012
 
December 31, 2016
 
894,254

 
$
15.72

 
352,850

2012
 
December 31, 2013
 
December 31, 2017
 
1,143,939

 
13.15

 
725,564

2013
 
December 31, 2014
 
December 31, 2018
 
1,405,906

 
11.83

 
702,953

2014
 
December 31, 2015
 
December 31, 2019
 
1,278,231

 
14.17

 
958,674

 
 
 
 
 
 
4,722,330

 
$
13.52

 
2,740,041

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
2011
 
December 31, 2012
 
December 31, 2016
 
569,854

 
$
53.72

 
222,243

2012
 
December 31, 2013
 
December 31, 2017
 
331,780

 
48.65

 
209,022

2013
 
December 31, 2014
 
December 31, 2018
 
395,016

 
46.45

 
197,510

2014
 
December 31, 2015
 
December 31, 2019
 
337,154

 
60.56

 
252,866

2015
 
December 31, 2016
 
December 31, 2020
 
390,400

 
51.88

 
390,400

 
 
 
 
 
 
2,024,204

 
$
52.56

 
1,272,041

________________________ 
(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 these unvested stock option grants as of December 31, 2015: 
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

 
1,428,531

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: 
 
2015 Grants
 
2014 Grants
 
2013 Grants
Risk-free interest rate
1.95-1.96%

 
1.93-1.96%

 
.18-1.94%

Dividend per share (quarterly amounts)
$0.38-0.43

 
$0.35-0.38

 
$0.35

Expected volatility factor
22.0-24.0%

 
22.0-25.0%

 
25.0-27.5%

Expected option term
6.29 years

 
6.3 years

 
.01-6.3 years

Weighted average fair value per option
$
12.68

 
$
14.23

 
$
11.73

Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes our unvested performance shares and restricted stock unit grants as of December 31, 2015: 
 
Number of Performance
Shares and Restricted Stock Units
 
Weighted Average
Grant Date Fair Value
Unvested at December 31, 2014
1,536,154

 
$
54.67

Granted
407,019

 
52.08

Vested
(492,129
)
 
55.27

Forfeitures
(179,004
)
 
62.13

Unvested at December 31, 2015
1,272,040

 
$
52.56

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, 2015: 
 
Number of Restricted
Shares and Stock Units
 
Weighted Average
Grant Date Fair Value
Unvested at December 31, 2014
954,124

 
$
52.12

Granted
482,222

 
51.93

Vested
(237,563
)
 
48.87

Forfeitures
(71,261
)
 
52.62

Unvested at December 31, 2015
1,127,522

 
$
52.69

Schedule Of Fair Value Stock Awards Vested
A summary of the fair value of full value awards vested (in thousands): 
2015
$
40,785

2014
36,510

2013
6,808

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
2015
 
228,103

 
$
13,045

 
$
2,269

2014
 
231,564

 
11,943

 
2,108

2013
 
259,730

 
12,928

 
2,281

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

The activity under that program for each of the periods reported is as follows (dollar amounts in thousands): 
 
 
Shares repurchased
 
Total value of shares
repurchased
2012 Program
 
 
 
 
2013 Purchases
 
10,000,000

 
$
579,853