Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Additional Information (Details)

v3.10.0.1
Fair Value of Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Related receivable $ 37,472 $ 31,444
Forward Contracts    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Related payable 66 66
Related receivable $ 739 $ 739