UNIT-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2013
Phantom and restricted units
 
MEMBERSHIP INTERESTS  
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, 2012

 
$

Phantom units granted
125,000

 
$
20.00

Restricted units granted
6,558

 
$
20.23

Nonvested phantom and restricted units, December 31, 2012
131,558

 
$
20.00

Phantom units granted
155,330

 
$
26.33

Restricted units granted
835

 
$
27.50

Phantom units forfeited
(4,041
)
 
$
25.99

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

 
$
23.41

Long-term Incentive Plan
 
MEMBERSHIP INTERESTS  
Schedule of non-cash compensation expense recognized in general and administrative expense
Unit-based compensation recognized in general and administrative expense related to awards under the LTIP was as follows:
 
Year ended December 31, 2013
 
2013
 
2012
 
2011
 
(In thousands)
SMLP unit-based compensation
$
2,999

 
$
269

 
$

DFW Net Profits Interests
 
MEMBERSHIP INTERESTS  
Schedule of activity
 
July
2010
grant
 
April
2010
grant
 
September
2009
grant
Length of holding period restriction (In years)
3.43

 
3.75

 
4.25

Discount for lack of marketability
35.9
%
 
30.9
%
 
34.8
%
Volatility
53.7
%
 
49.8
%
 
52.5
%

Information regarding the amount and grant date fair value of the vested and nonvested DFW Net Profits Interests were as follows:
 
Year ended December 31,
 
2013
 
2012
 
2011
 
Percentage Interest
 
Weighted-average grant date fair value (per 1.0% of DFW Net Profits Interest)
 
Percentage Interest
 
Weighted-average grant date fair value (per 1.0% of DFW Net Profits Interest)
 
Percentage Interest
 
Weighted-average grant date fair value (per 1.0% of DFW Net Profits Interest)
 
(Dollars in thousands)
Nonvested, beginning of period
0.038
%
 
$
1,650

 
1.750
%
 
$
306

 
2.850
%
 
$
295

Repurchased
0.038
%
 
$
1,650

 
0.000
%
 
$

 
0.000
%
 
$

Granted
0.000
%
 
$

 
0.000
%
 
$

 
0.000
%
 
$

Vested
0.000
%
 
$

 
1.644
%
 
$
256

 
1.100
%
 
$
277

Forfeited
0.000
%
 
$

 
0.069
%
 
$
765

 
0.400
%
 
$
220

Nonvested, end of period
0.000
%
 
$

 
0.038
%
 
$
1,650

 
1.750
%
 
$
306

 
 
 
 
 
 
 
 
 
 
 
 
Vested, end of period
0.000
%
 
$

 
4.294
%
 
$
257

 
2.650
%
 
$
258

Schedule of inputs used in the option pricing method
The inputs we used in the option pricing method for the DFW Net Profits Interests by grant date were as follows:
 
July
2010
grant
 
April
2010
grant
 
September
2009
grant
Length of holding period restriction (In years)
3.43

 
3.75

 
4.25

Discount for lack of marketability
35.9
%
 
30.9
%
 
34.8
%
Volatility
53.7
%
 
49.8
%
 
52.5
%
Schedule of non-cash compensation expense recognized in general and administrative expense
We recognized non-cash compensation expense ratably over the four-year vesting period. Non-cash compensation expense, related to the DFW Net Profits Interests, recognized within general and administrative expense was as follows:
 
 
Year ended December 31,
 
 
2013
 
2012
 
2011
 
 
(In thousands)
Non-cash compensation expense
 
$
17

 
$
688

 
$
2,171

SMP Net Profits Interests
 
MEMBERSHIP INTERESTS  
Schedule of activity
Information regarding the amount and grant-date fair value of the vested and nonvested SMP Net Profits Interests for the periods in which they were reflected in our financial results was as follows:
 
Year ended December 31,
 
2012
 
2011
 
Percentage Interest
 
Weighted-average grant date fair value (per 1.0% of SMP Net Profits Interest)
 
Percentage Interest
 
Weighted-average grant date fair value (per 1.0% of SMP Net Profits Interest)
 
(Dollars in thousands)
Nonvested, beginning of period
3.958
%
 
$
1,003

 
2.944
%
 
$
601

Granted
0.500
%
 
$
1,780

 
2.000
%
 
$
1,505

Vested
1.271
%
 
$
965

 
0.986
%
 
$
818

Nonvested, end of period
3.187
%
 
$
1,140

 
3.958
%
 
$
1,003

 
 
 
 
 
 
 
 
Vested, end of period
3.168
%
 
$
788

 
1.897
%
 
$
669

Schedule of inputs used in the option pricing method
The inputs used in the option pricing method for the SMP Net Profits Interests by grant date were as follows:
 
January
2012
grant
 
October
2011
grant
 
April
2011
grant
 
April
2010
 grant
 
September 2009
 grant
Length of holding period restriction (In years)
2.93

 
3.21

 
4.75

 
3.75

 
4.25

Discount for lack of marketability
24.0
%
 
33.1
%
 
29.6
%
 
30.9
%
 
34.8
%
Volatility
37.0
%
 
49.3
%
 
43.2
%
 
49.8
%
 
52.5
%
Schedule of non-cash compensation expense recognized in general and administrative expense
Non-cash compensation expense, related to the SMP Net Profits Interests, recognized in general and administrative expense for the periods in which they were reflected in our financial results was as follows:
 
 
Year ended December 31,
 
 
2012
 
2011
 
 
(In thousands)
Non-cash compensation expense
 
$
919

 
$
1,269