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COMMON STOCK PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Performance Share Award Activity
A summary of performance share award activity as of December 31, 2017, and transactions during the years ended December 31, 2017, 2016 and 2015 is presented below:

 
Performance Share Awards



                       Shares
Weighted
Average Price
Nonvested at December 31, 2014
212,968

$
71.53

Granted (three-year vesting period)
120,372

83.94

Vested and paid
(77,257
)
61.36

Nonvested at December 31, 2015
256,083

80.43

Granted (three-year vesting period)
167,016

25.34

Vested and paid
(74,176
)
63.88

Forfeited
(12,481
)
72.30

Nonvested at December 31, 2016
336,442

57.03

Granted (two-year vesting period)
3,116

96.54

Granted (three-year vesting period)
137,084

66.89

Vested and paid
(59,530
)
93.52

Forfeited
(17,075
)
48.55

Nonvested at December 31, 2017
400,037

$
55.65
Schedule of Restricted Stock Activity and Transactions
A summary of restricted stock award activity as of December 31, 2017, and transactions during the years ended December 31, 2017, 2016 and 2015 is presented below:

 
Restricted Stock
 
Awards
Weighted Average Price
Nonvested at December 31, 2014
99,574

$
59.60

Restricted stock units granted
99,814

65.15

Vested
(14,446
)
53.20

Nonvested at December 31, 2015
184,942

63.09

Restricted stock units granted
197,473

29.89

Vested
(56,337
)
54.70

Forfeited
(435
)
40.73

Nonvested at December 31, 2016
325,643

44.44

Restricted stock units granted
128,272

52.42

Vested
(45,576
)
65.68

Forfeited
(2,803
)
44.68

Nonvested at December 31, 2017
405,536

$
44.58
Schedule of Stock Option Activity and Transactions
A summary of stock option activity as of December 31, 2017, and transactions during the years ended December 31, 2017, 2016 and 2015 are presented below:

 
      Stock Options



Shares
Weighted Average Exercise Price
Outstanding at December 31, 2014
757,071

$
54.88

Exercised
(23,680
)
41.42

Outstanding at December 31, 2015
733,391

55.32

Exercised
(22,490
)
44.60

Outstanding at December 31, 2016
710,901

55.66

Exercised
(6,052
)
48.36

Expired
(27,284
)
58.40

Outstanding at December 31, 2017
677,565

$
55.61

Exercisable at December 31, 2015
622,156

$
53.80

Exercisable at December 31, 2016
676,271

$
54.79

Exercisable at December 31, 2017
677,565

$
55.61
Schedule of Outstanding Stock Options by Range of Exercise Prices
The following table summarizes options outstanding as of December 31, 2017:


Exercise Prices

Shares
Weighted Average Remaining Contractual Life
$60.56
48,560
0.07 years
$29.79
21,791
1.00 year
$46.69
26,481
2.00 years
$54.99
101,285
3.00 years
$54.11
254,426
4.00 years
$48.36
117,446
5.00 years
$80.48
3,686
5.79 years
$72.39
101,451
6.00 years
$79.63
2,439
6.00 years
$29.79-$80.48
677,565
3.88 years
Summary of Stock Appreciation Rights Activity
A summary of stock appreciation rights activity as of December 31, 2017, and transactions during the years ended December 31, 2017, 2016 and 2015 are presented below:

 
                  Stock Appreciation Rights Plan



Shares
Weighted Average Exercise Price
Outstanding at December 31, 2014
275,150

$
52.96

Exercised/forfeited
(10,283
)
55.18

Outstanding at December 31, 2015
264,867

52.88

Exercised/forfeited
(12,338
)
61.51

Outstanding at December 31, 2016
252,529

52.46

Exercised/forfeited
(12,285
)
50.43

Outstanding at December 31, 2017
240,244

$
52.56
Schedule of Stock Appreciation Rights Valuation Assumptions
For purposes of this valuation the following assumptions were used to derive the fair values as of December 31, 2017:

Grant date
1/22/2014
1/22/2014
1/22/2014
1/24/2013
1/24/2013
1/24/2013
 
 
(modified)
(modified)
 
(modified)
(modified)
Awards granted
46,710
15,517
522
63,436
20,218
768
Fair market value of award
$11.53
$6.92
$4.93
$18.89
$16.21
$14.43
Expected life of award
3.03 years
1.63 years
1.13 years
2.53 years
1.63 years
1.13 years
Risk-free interest rate
1.98%
1.86%
1.79%
1.92%
1.86%
1.79%
Annualized volatility rate
38.1%
38.1%
38.1%
38.1%
38.1%
38.1%
Dividend yield
—%
—%
—%
—%
—%
—%


Grant date
1/24/2013
1/26/2011
1/26/2011
1/27/2010
1/28/2009
2/4/2008
 
(modified)
 
(modified)
 
 
 
Awards granted
3,578
182,199
7,785
171,749
305,257
67,093
Fair market value of award
$11.69
$12.54
$7.64
$15.12
$28.06
$0.25
Expected life of award
0.50 years
1.54 years
0.50 years
1.04 years
0.54 years
0.05 years
Risk-free interest rate
1.53%
1.86%
1.53%
1.77%
1.54%
1.25%
Annualized volatility rate
38.1%
38.1%
38.1%
38.1%
38.1%
38.1%
Dividend yield
—%
—%
—%
—%
—%
—%
Schedule of Incentive Units Activity
A summary of Petrotech unit activity as of December 31, 2017, and transactions during the years ended December 31, 2017, 2016 and 2015 are presented below:

 
 
 Petrotech Incentive Plan


 
Shares
Outstanding at December 31, 2014
 
213,870

Granted (three-year vesting period)
 
128,519

Granted (two-year vesting period)
 
297

Granted (16 month vesting period)
 
1,648

Paid
 
(78,430
)
Forfeited
 
(22,158
)
Outstanding at December 31, 2015
 
243,746

Paid
 
(67,392)
Forfeited
 
(32,111)
Outstanding at December 31, 2016
 
144,243

Paid
 
(55,973)
Forfeited
 
(4,095)
Outstanding at December 31, 2017
 
84,175