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Earnings per Unit
 6 Months Ended
Jun. 30, 2019
Earnings Per Unit [Abstract]  
Earnings Per Unit Earnings per Unit:
Net income (loss) per limited partner unit is calculated based on the following unit amounts:
 
Three months ended
 
Six months ended
 
June 30, 2019
 
June 24, 2018
 
June 30, 2019
 
June 24, 2018
 
(In thousands, except per unit amounts)
Basic weighted average units outstanding
56,474

 
56,231

 
56,334

 
56,192

Effect of dilutive units:
 
 
 
 
 
 
 
Deferred units
47

 
46

 
—

 
—

Restricted units
243

 
277

 
—

 
—

Unit options
122

 
173

 
—

 
—

Diluted weighted average units outstanding
56,886

 
56,727

 
56,334

 
56,192

Net income (loss) per unit - basic
$
1.12

 
$
0.34

 
$
(0.36
)
 
$
(1.14
)
Net income (loss) per unit - diluted
$
1.11

 
$
0.34

 
$
(0.36
)
 
$
(1.14
)