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UNIT-BASED AND NONCASH COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of unit-based compensation recognized in general and administrative expense
Unit-based compensation recognized in general and administrative expense related to awards under the SMLP LTIP follows.
 
Year ended December 31,
 
2015
 
2014
 
2013
 
 
 
 
 
 
 
(In thousands)
SMLP LTIP unit-based compensation
$
6,174

 
$
4,696

 
$
2,999
Phantom and Restricted Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of activity
The following table presents phantom and restricted unit activity:
 
Units
 
Weighted-average grant date
fair value
Nonvested phantom and restricted units, January 1, 2013
131,558

 
$
20.00

Phantom and restricted units granted
156,165

 
26.33

Phantom units forfeited
(4,041
)
 
25.99

Nonvested phantom and restricted units, December 31, 2013
283,682

 
23.41

Phantom units granted
136,867

 
42.32

Phantom and restricted units vested
(61,917
)
 
25.33

Phantom units forfeited
(22,430
)
 
25.56

Nonvested phantom units, December 31, 2014
336,202

 
30.61

Phantom units granted
289,735

 
29.21

Phantom units vested
(229,497
)
 
27.66

Phantom units forfeited
(16,529
)
 
35.09

Nonvested phantom units, December 31, 2015
379,911

 
$
31.13