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Accumulated Other Comprehensive Income (Loss) - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Net decrease in other comprehensive loss $ (41,159) $ (1,728) $ 21,292 $ (10,944) $ (84,929) $ 42,637 $ (21,595) $ (53,236)
Currency Translation Adjustments                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Net decrease in other comprehensive loss $ (46,722)     $ (17,132)     $ (33,759) $ (80,870)