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Commitments and Contingencies - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies    
Long-term contracts, contract price $ 3,402 $ 75,824
Long-term contracts, commitments amount 2,380 38,579
Letter of credit 488  
Contractual obligation $ 129,420 $ 172,986