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Accumulated Other Comprehensive Income (Loss) - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Net increase (decrease) in other comprehensive income (loss) $ (1,728) $ 21,292 $ (84,929) $ 42,637 $ 19,564 $ (42,292)
Currency translation adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Net increase (decrease) in other comprehensive income (loss) $ (1,170)   $ (105,727)   $ 12,963 $ (63,738)