Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Cash Flow Hedge Impact on AOCI (Details)

v3.10.0.1
Financial Instruments - Cash Flow Hedge Impact on AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative        
Cost of goods sold $ (326,309) $ (281,853) $ (614,385) $ (532,072)
Interest (expense) income (27,221) (48,176) (56,384) (94,961)
Gain (loss) on cash flow hedging relationships | Amount of gain (loss) reclassified from AOCI into income        
Derivative        
Cost of goods sold (99) (28) (71) (10)
Interest (expense) income $ (58) $ (9) $ (93) $ (11)