Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Financial and Non-Financial Liabilities (Details)

v3.8.0.1
Fair Value Measurements - Summary of Financial and Non-Financial Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 0 $ 0
Liabilities 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 87,532 9,184
Liabilities 35,523 145,978
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 0 0
Liabilities $ 0 $ 0