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Selected Quarterly Financial Information
12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Information
(11) Selected Quarterly Financial Information

Summarized quarterly financial data for the years ended December 31, 2019 and 2018 is as follows:
 Year Ended December 31, 2019
 Quarter
(in thousands)FirstSecondThirdFourth
Net sales$91,873  $137,660  $88,582  $86,062  
Cost of materials and other (1)23,730  26,000  21,617  22,756  
Direct operating expenses (1)34,820  45,630  47,557  45,622  
Operating income (loss)9,439  34,544  (7,517) (9,086) 
Net (loss) income(6,079) 18,968  (22,976) (24,882) 
Basic and diluted (loss) income per common unit$(0.05) $0.17  $(0.20) $(0.22) 
Basic and diluted weighted-average common units outstanding113,283  113,283  113,283  113,283  

 Year Ended December 31, 2018
 Quarter
(in thousands)FirstSecondThirdFourth
Net sales$79,859  $93,197  $79,909  $98,117  
Cost of materials and other (1)22,469  19,139  19,590  27,263  
Direct operating expenses (1)38,669  47,465  35,334  37,851  
Operating income (loss)(3,421) (790) 2,529  7,996  
Net loss(19,051) (16,459) (13,146) (1,371) 
Basic and diluted loss per common unit$(0.17) $(0.15) $(0.12) $(0.01) 
Basic and diluted weighted-average common units outstanding113,283  113,283  113,283  113,283  

(1)Excludes depreciation and amortization expenses.