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Prepaid and other assets (Tables)
12 Months Ended
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid and Other Assets
December 31
20192018
TotalThereof currentThereof non‑currentTotalThereof currentThereof non‑current
(In thousands)
Miscellaneous other receivables$36,531  $36,189  $342  $34,052  $33,750  $302  
Prepaid expenses4,529  1,170  3,359  3,814  1,188  2,626  
Total$41,059  $37,358  $3,701  $37,866  $34,938  $2,928