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Other assets
 12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other assets
Other assets
Other assets consist of the following:
 
2017
 
2016
Income tax receivable
$
7,485

 
$
2,951

Deferred financing costs
4,448

 
10,198

Other
18,633

 
6,136

 
30,566

 
19,285

Less current portion
(8,919
)
 
(2,951
)
 
$
21,647

 
$
16,334