Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Net Investment Hedge Impact on AOCI (Details)

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Financial Instruments - Net Investment Hedge Impact on AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (loss) on sale of subsidiary      
Derivative [Line Items]      
Amount of gain (loss) reclassified from AOCI into income $ 0 $ 0 $ 0
Interest (expense) income      
Derivative [Line Items]      
Amount of gain (loss) recognized in income on derivative (amount excluded from effectiveness testing) 8,035 7,898 0
Cross currency swaps      
Derivative [Line Items]      
Amount of gain (loss) recognized in OCI on derivative $ 17,077 $ 18,843 $ 0