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Commitments and Contingencies - Other contractual commitments and Contingencies (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Remaining payments to be made under other contractual agreements    
No later than 1 year $ 40,999,000 $ 51,685,000
Later than 1 year and no later than 5 years 2,007,000 6,241,000
Total 43,006,000 $ 57,926,000
Contingencies    
Contingent liabilities $ 0