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Derivatives - Summarizes Gross Asset and Liability Amounts Related to Derivatives (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Forward currency contracts    
Derivative [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ 19,760 $ 23,753
Gross Amounts Offset in the Condensed Consolidated Balance Sheet (258) (53)
Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheet 19,502 23,700
Interest rate swaps    
Derivative [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (13,113) 0
Gross Amounts Offset in the Condensed Consolidated Balance Sheet 0 0
Net Amounts of Assets (Liabilities) Presented in the Condensed Consolidated Balance Sheet $ (13,113) $ 0