Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Detail - Accounts payable (Details)

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Balance Sheet Detail - Accounts payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts payable and accrued expenses    
Trade accounts payable $ 64,752 $ 58,910
Accrued expenses 3,179 3,882
Accounts payable and accrued expenses $ 67,931 $ 62,792