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Other Assets and Liabilities - Other Non-Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Other Non-Current Assets:    
Deferred tax assets $ 6,728 $ 3,877
Long-term deposit 3,350 3,350
Guarantee from Armistice 6,153 0
Other 4,010 3,022
Total $ 20,241 $ 10,249