Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policies - Earning Per Common Share (Details)

v3.19.1
Basis of Presentation and Accounting Policies - Earning Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to SEACOR $ 7,733 $ 641
Effect of Dilutive Securities:    
Options and Restricted Stock 0 0
Convertible Notes 318 0
Net income attributable to SEACOR, diluted $ 8,051 $ 641
Weighted average number of shares outstanding, basic (in shares) 18,232,562 17,969,970
Effect of Dilutive Securities:    
Options and Restricted Stock (in shares) 111,676 208,548
Convertible Notes (in shares) 1,227,101 0
Weighted average number of shares outstanding, diluted (in shares) 19,571,339 18,178,518
Basic earnings per common share (in dollars per share) $ 0.42 $ 0.04
Diluted earnings per common share (in dollars per share) $ 0.41 $ 0.04
3.0% Convertible Senior Notes    
Effect of Dilutive Securities:    
Debt instrument, interest rate, stated percentage 3.00%  
3.25% Convertible Senior Notes    
Effect of Dilutive Securities:    
Debt instrument, interest rate, stated percentage 3.25%  
2.5% Convertible Senior Notes    
Effect of Dilutive Securities:    
Debt instrument, interest rate, stated percentage 2.50%  
Stock Compensation Plan    
Effect of Dilutive Securities:    
Anti-dilutive securities (in shares) 1,012,711 503,459
Convertible Debt Securities | 3.0% Convertible Senior Notes    
Effect of Dilutive Securities:    
Anti-dilutive securities (in shares) 1,302,221 2,895,516
Convertible Debt Securities | 3.25% Convertible Senior Notes    
Effect of Dilutive Securities:    
Anti-dilutive securities (in shares) 1,553,780  
Convertible Debt Securities | 2.5% Convertible Senior Notes    
Effect of Dilutive Securities:    
Anti-dilutive securities (in shares)   1,227,101