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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net Income attributable to Royal Caribbean Cruises Ltd. for basic and diluted earnings per share $ 249,681 $ 218,653
Weighted-average common shares outstanding (in shares) 209,322,000 212,610,000
Dilutive effect of stock-based awards and stock options (in shares) 552,000 992,000
Diluted weighted-average shares outstanding (in shares) 209,874,000 213,602,000
Basic earnings per share (in dollars per share) $ 1.19 $ 1.03
Diluted earnings per share (in dollars per share) $ 1.19 $ 1.02
Antidilutive securities (in shares) 0 0