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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Noncurrent
Inventories consist of the following:
 
 
 
December 31,

2018
 
 
December 31,

2017
 
(in thousands)
 
 
 
 
 
 
 
 
Refrigerants and cylinders
 
$
115,348
 
 
$
174,262
 
Less: net realizable value adjustments
 
 
(13,386
)
 
 
(1,777
)
Total
 
$
101,962
 
 
$
172,485