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UNIT-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
NSH restricted units award activity under the 2006 Long-Term Incentive Plan
The following table summarizes information related to outstanding NSH restricted units awarded under the 2006 LTIP:
 
Restricted
Unit Grants
to Employees
 
Restricted
Unit Grants
to Non-
Employee
Directors
 
Total
 
Weighted-
Average
Grant-Date
Fair Value
Per Unit
Balance as of January 1, 2014
39,204

 
21,194

 
60,398

 
$
28.83

Granted
16,895

 
8,911

 
25,806

 
$
34.22

Vested
(12,264
)
 
(9,680
)
 
(21,944
)
 
$
29.22

Forfeited
(4,745
)
 
—

 
(4,745
)
 
$
27.46

Balance as of December 31, 2014
39,090

 
20,425

 
59,515

 
$
31.13

Granted
26,240

 
12,814

 
39,054

 
$
23.80

Vested
(11,403
)
 
(10,086
)
 
(21,489
)
 
$
30.80

Balance as of December 31, 2015
53,927

 
23,153

 
77,080

 
$
27.51

Granted
32,456

 
12,126

 
44,582

 
$
25.42

Vested
(15,251
)
 
(11,637
)
 
(26,888
)
 
$
28.23

Balance as of December 31, 2016
71,132

 
23,642

 
94,774

 
$
26.32
Schedule of restricted unit awards
The following table presents supplemental information regarding our restricted unit awards:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Thousands of Dollars, Except Unit Data)
DERs paid to restricted unitholders
$
(167
)
 
$
(129
)
 
$
(118
)
Fair value of restricted units that vested during the period
$
700

 
$
379

 
$
742

Units issued for settlement of awards vested, net of employee tax withholding requirements
21,200

 
17,272

 
256,996
The number of awards granted under the 2000 Long-Term Incentive Plan
The following table summarizes information about awards we granted under the 2000 LTIP, prior to the Employee Transfer:
 
 
 
 
Awards Granted
 
 
 
 
Year Ended December 31,
 
 
Vesting
 
2016
 
2015
 
2014
2000 LTIP:
 
 
 
 
 
 
 
 
Performance units
 
(a)
 
47,646

 
29,633

 
28,841

Restricted units
 
1/5 per year
 
—

 
250,563

 
208,714

Restricted units (grants to non-employee directors of NuStar GP, LLC)
 
1/3 per year
 
—

 
7,553

 
7,009

 
(a)
Performance units vest 1/3 per year if certain performance measures are met, as defined in the award agreements.

Summary of long-term incentive plan compensation expenses
The following table summarizes information pertaining to long-term incentive plan compensation expenses:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Thousands of Dollars)
Long-term incentive plan compensation expense charged to NuStar Energy
$
490

 
$
6,397

 
$
10,934

Expenses resulting from NuStar GP Holdings awards
$
661

 
$
239

 
$
129