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Other Assets and Accrued Liabilities - Long-Term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]      
Non-current portion of deferred revenues $ 12,327   $ 12,593
Noncurrent portion of financing leases 1,629    
Other 1,603   1,771
Other liabilities $ 15,559 $ 16,008 $ 14,364