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Employee Benefit Plans And Equity-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary Of Service-Based And Performance-Based Awards
A summary of our phantom unit activity for our service-based and performance-based awards is set forth below:
 
 
Service-Based Awards
 
Performance-Based Awards
 
Number of
Phantom
Units
 
Average
Grant
Date Fair
Value
 
Total
Value
(in thousands)
 
Number of
Phantom
Units
 
Average
Grant
Date Fair
Value
 
Total
Value
(in thousands)
Unvested at December 31, 2014
112,823

 
$
44.53

 
$
5,024

 
313,845

 
$
42.82

 
$
13,439

Granted
58,192

 
$
44.40

 
2,584

 
154,633

 
$
45.15

 
6,982

Forfeited
(2,856
)
 
$
47.26

 
(135
)
 
(4,201
)
 
$
46.00

 
(193
)
Settled
(35,483
)
 
$
30.79

 
(1,093
)
 
(120,069
)
 
$
31.50

 
(3,782
)
Unvested at December 31, 2015
132,676

 
$
48.09

 
$
6,380

 
344,208

 
$
47.78

 
$
16,446
Assumptions Used To Determine Fair Value Of Rights
The estimates that we make each period to determine the fair value of these rights include the following assumptions:
 
 
Assumptions Used for Fair Value of Rights
 
December 31, 2015
 
December 31, 2014
 
December 31, 2013
Expected life of rights (in years)
Less than 1
 
Less than 1
 
Less than 1
Risk-free interest rate
—%
-
0.07%
 
—%
-
0.07%
 
—%
-
0.07%
Expected unit price volatility
39.3%
 
39.3%
 
39.3%
Expected future distribution yield
5.00%
 
5.00%
 
5.00%
Reconciliation Of Rights Activity
The following table reflects rights activity under our Stock Appreciation Rights Plan as of January 1, 2015, and changes during the year ended December 31, 2015:
 
 
Stock Appreciation Rights
 
Weighted
Average
Strike Price
 
Weighted
Average
Contractual
Remaining
Term (Yrs)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2014
160,855

 
$
18.08

 
 
 
 
Exercised during 2015
(30,607
)
 
$
41.69

 
 
 
 
Forfeited or expired during 2015
(571
)
 
$
20.92

 
 
 
 
Outstanding at December 31, 2015
129,677

 
$
18.55

 
2.14
 
$
2,350

Exercisable at December 31, 2015
129,677

 
$
18.55

 
2.14
 
$
2,350
Expense Related To Equity-Based Compensation Plans
Equity-based compensation expense from our continuing operations during the three years ended December 31, 2015 was as follows:
 
 
 
Expense Related to Equity-Based Compensation Plans
Consolidated Statement of Operations
 
2015
 
2014
 
2013
Supply and logistics operating costs
 
$
1,201

 
$
485

 
$
4,524

Marine transportation operating costs
 
851

 
626

 
586

Refinery services operating costs
 
227

 
(62
)
 
1,978

Offshore pipeline operating costs
 
94

 
—

 
—

Onshore pipeline operating costs
 
(16
)
 
(52
)
 
510

General and administrative expenses
 
4,565

 
5,824

 
11,073

Total
 
$
6,922

 
$
6,821

 
$
18,671