Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details 3)

v3.8.0.1
Financial Instruments (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Asset $ 2,118 $ 0 $ 734 $ 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) $ 1,384 $ 0