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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income, Other Expenses, and Change in Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other comprehensive loss:      
Stockholders' equity, beginning balance $ 1,464,227 $ 1,862,463 $ 2,285,134
Other comprehensive income (loss):      
Foreign currency translation and other adjustments 46,635 11,866 (160,702)
Change in fair value of derivative instruments (39,947) (8,783) (973)
Total other comprehensive (loss) income 6,688 3,083 (161,675)
Stockholders' equity, ending balance 1,136,729 1,464,227 1,862,463
FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS      
Other comprehensive loss:      
Stockholders' equity, beginning balance (252,825) (264,691) (103,989)
Other comprehensive income (loss):      
Foreign currency translation and other adjustments 46,635 11,866 (160,702)
Change in fair value of derivative instruments 0 0 0
Total other comprehensive (loss) income 46,635 11,866 (160,702)
Stockholders' equity, ending balance (206,190) (252,825) (264,691)
CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTS      
Other comprehensive loss:      
Stockholders' equity, beginning balance (9,756) (973) 0
Other comprehensive income (loss):      
Foreign currency translation and other adjustments 0 0 0
Change in fair value of derivative instruments (39,947) (8,783) (973)
Total other comprehensive (loss) income (39,947) (8,783) (973)
Stockholders' equity, ending balance (49,703) (9,756) (973)
TOTAL      
Other comprehensive loss:      
Stockholders' equity, beginning balance (262,581) (265,664) (103,989)
Other comprehensive income (loss):      
Stockholders' equity, ending balance $ (255,893) $ (262,581) $ (265,664)