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Long-Term Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Changes In Non-Vested Unit Awards
The amounts below include no adjustments for above-target or below-target performance and forfeitures are actual amounts through December 31, 2015.
 
 
Equity Method
 
Liability Method Performance-Based Awards
 
 
 
 
 
 
Performance-Based Awards
 
Time-Based Awards
 
 
Total Awards
 
 

Number of Unit
Awards
 
Weighted-Average Grant Date Fair Value
 

Number of Unit
Awards
 
Weighted-Average Grant Date Fair Value
 

Number of Unit
Awards
 
Weighted-Average Fair Value
 

Number of Unit
Awards
 
Weighted-Average Fair Value
Non-vested units - 1/1/2015
 
350,317

 
$
62.85

 
46,668

 
$
76.99

 
40,878

 
$
82.66

 
437,863

 
$
66.21

Units granted during 2015
 
148,028

 
$
88.78

 
26,421


$
81.51


—


$
—

 
174,449

 
$
87.68

Units vested during 2015
 
(161,898
)
 
$
51.42

 
(444
)
 
$
56.42

 
(40,470
)
 
$
67.92

 
(202,812
)
 
$
54.73

Units forfeited during 2015
 
(23,207
)
 
$
81.28

 
(14,963
)
 
$
67.41

 
(408
)
 
$
67.92

 
(38,578
)
 
$
75.76

Non-vested units - 12/31/15
 
313,240

 
$
79.64

 
57,682

 
$
81.74

 
—

 
$
—

 
370,922

 
$
79.97
Total Non-Vested Unit Awards
The table below summarizes the total non-vested unit awards granted by the compensation committee adjusted for units we estimate will be forfeited by the end of the vesting period and for estimated amounts of above-target financial performance to determine the total number of unit awards included in our total equity-based liability accrual.
Grant Date
Unit Awards Granted
 
Estimated Forfeitures
 
Adjustment to Unit Awards in Anticipation of Achieving Above- Target Financial Results
 
Total Unit Award Accrual
 
Vesting Date
 
Unrecognized Compensation Expense(a)         (in millions)
 
Performance-Based Awards:
 
 
 
 
 
 
 
 
 
 
 
 
2014 Awards
187,371

 
21,662

 
124,283

 
289,992

 
12/31/2016
 
$
7.0

 
2015 Awards
148,028

 
15,105

 
33,232

 
166,155

 
12/31/2017
 
9.8

 
Time-Based Awards:
 
 
 
 
 
 
 
 
 
 
 
 
2016 Vesting Date
20,757

 
12,121

 
—

 
8,636

 
12/31/2016
 
0.2

 
2017 Vesting Date
51,859

 
4,612

 
—

 
47,247

 
12/31/2017
 
2.6

 
Total
408,015

 
53,500

 
157,515

 
512,030

 
 
 
$
19.6

 
 
 
 
 
 
 
 
 
 
 
 
 
 

(a) Unrecognized compensation expense will be recognized over the remaining vesting period of the awards.
Weighted-Average Grant Date Fair Values
The weighted-average grant-date fair value of award grants issued during 2013, 2014 and 2015 were as follows:
 
 
Equity Method
 
 
 
 
Performance-Based Awards
 
Time-Based Awards
 
Liability Method Performance-Based Awards
 
 

Number of
Unit
Awards
 
Weighted-Average Grant Date Fair Value
 

Number of Unit
Awards
 
Weighted-Average Grant Date Fair Value
 

Number of Unit
Awards
 
Weighted-Average Fair Value
Units granted during 2013
 
182,798

 
$
51.49

 
22,668

 
$
53.02

 
45,700

 
$
51.49

Units granted during 2014
 
187,371

 
$
72.77

 
33,903

 
$
82.86

 
—

 
$
—

Units granted during 2015
 
148,028

 
$
88.78

 
26,421

 
$
81.51

 
—

 
$
—
Vested Unit Awards
The table below sets forth the numbers and values of units that vested in each of the three years ended December 31, 2015. The vested limited partner units include adjustments for above-target performance.
Vesting Date
 
Vested
Limited
Partner Units
 
Fair Value of Unit Awards on Vesting Date (in millions)
 
Intrinsic Value of Unit Awards on Vesting Date (in millions)
12/31/2013
 
572,353
 
$20.5
 
$36.2
12/31/2014
 
528,984
 
$22.4
 
$43.7
12/31/2015
 
506,393
 
$27.7
 
$34.4
 
 
 
 
 
 
 
Cash Flow Effects Of LTIP Settlements
We settle awards that vest by issuing limited partner units. The difference between the limited partner units issued to the participants and the total units accrued represents the minimum tax withholdings associated with the award settlement, which we pay in cash.
Settlement Date
 
Number of Limited Partner Units Issued, Net of Tax Withholdings
 
Minimum Tax Withholdings
(in millions)
 
Employer Taxes (in millions)
 
Total Cash Taxes Paid (in millions)
January 2013
 
476,682
 
$12.3
 
$1.1
 
$13.4
January 2014
 
387,216
 
$14.8
 
$1.2
 
$16.0
January 2015
 
354,529
 
$17.8
 
$1.7
 
$19.5
Equity-Based Incentive Compensation Expense
Equity-based incentive compensation expense for 2013, 2014 and 2015 was as follows (in thousands):
 
 
Year Ended December 31, 2013
 
Year Ended December 31, 2014
 
Year Ended December 31, 2015
 
Equity
Method
 
Liability
Method
 
Total
 
Equity
Method
 
Liability
Method
 
Total
 
Equity
Method
 
Liability
Method
 
Total
2010 awards
$
121

 
$
73

 
$
194

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

2011 awards
5,359

 
4,280

 
9,639

 
—

 
—

 
—

 
—

 
—

 
—

2012 awards
4,751

 
2,747

 
7,498

 
4,418

 
3,896

 
8,314

 
—

 
—

 
—

2013 awards
4,726

 
1,451

 
6,177

 
7,427

 
3,425

 
10,852

 
8,661

 
1,997

 
10,658

2014 awards
—

 
—

 
—

 
6,494

 
—

 
6,494

 
7,471

 
—

 
7,471

2015 awards
—

 
—

 
—

 
—

 
—

 
—

 
4,917

 
—

 
4,917

Time-based awards
575

 
—

 
575

 
1,624

 
—

 
1,624

 
1,199

 
—

 
1,199

Total
$
15,532

 
$
8,551

 
$
24,083

 
$
19,963

 
$
7,321

 
$
27,284

 
$
22,248

 
$
1,997

 
$
24,245

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allocation of LTIP expense on our consolidated statements of income:
 
 
 
 
 
 
 
 
 
 
G&A expense
 
 
 
$
23,264

 
 
 
 
 
$
26,700

 
 
 
 
 
$
23,937

Operating expense
 
 
 
819

 
 
 
 
 
584

 
 
 
 
 
308

Total
 
 
 
$
24,083

 
 
 
 
 
$
27,284

 
 
 
 
 
$
24,245