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Partners' Equity and Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Partners' Capital Notes [Abstract]  
Share-based Compensation, Activity
Equity-based compensation expense recognized in the consolidated statements of operations and comprehensive income within "Selling, General and Administrative Expense" for the applicable periods was as follows:
 
 
Years Ended December 31,
(In thousands)
 
2019
 
2018
 
2017
Awards Payable in Cash or Equity
 
 
 
 
 


Performance units
 
$
—

 
$
—

 
$
507

Deferred units
 
611

 
(266
)
 
627

Awards Payable in Equity
 
 
 
 
 
 
Performance units
 
5,535

 
5,413

 
8,822

Restricted units
 
6,375

 
5,830

 
4,612

Total equity-based compensation expense
 
$
12,521

 
$
10,977

 
$
14,568
Schedule of Share-based Compensation, Stock Options, Activity
Performance Units
(In thousands, except per unit amounts)
 
Number of Units
 
Weighted Average Grant Date Fair Value Per Unit
Unvested performance units at December 31, 2018
 
379

 
$
56.86

Granted (1)
 
131

 
$
55.63

Forfeited
 
(14
)
 
$
58.10

Vested
 
(101
)
 
$
57.00

Unvested performance units at December 31, 2019
 
395

 
$
56.36


(1) Includes 21 forfeitable distribution-equivalent units
(In thousands, except per unit amounts)
 
Unit Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Life
 
Aggregate Intrinsic Value
Options outstanding at December 31, 2018
 
368

 
$
34.51

 
 
 
 
Exercised
 
(7
)
 
35.97

 
 
 
 
Options outstanding at December 31, 2019
 
362

 
$
34.49

 
 
 
 
Options exercisable, end of year
 
362

 
$
34.49

 
2.8 years
 
$
7,575


Deferred Units
(In thousands, except per unit amounts)
 
Number of Units
 
Weighted Average Grant Date Fair Value Per Unit
Outstanding deferred units at December 31, 2018
 
56

 
$
54.21

Granted (1)
 
3

 
$
54.17

Forfeited
 
—

 
—

Settled
 
(10
)
 
54.45

Outstanding deferred units at December 31, 2019
 
49

 
$
54.16


(1) Includes 3 distribution-equivalent units
Schedule of Nonvested Restricted Stock Units Activity
Restricted Units
(In thousands, except per unit amounts)
 
Number of Units
 
Weighted Average Grant Date Fair Value Per Unit
Unvested restricted units at December 31, 2018
 
310

 
$
57.85

Granted
 
77

 
$
55.44

Forfeited
 
(6
)
 
$
57.02

Vested
 
(71
)
 
$
58.60

Unvested restricted units at December 31, 2019
 
310

 
$
57.07