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Share Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock authorized for grant under the Share Incentive Plans   2,174,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,556,300  
Adjustments to Additional Paid in Capital, Other $ (2,656)  
Additional compensation expense 800  
Unrecognized compensation costs 5,200  
Compensation costs expected to be recognized in 2018 1,700  
Compensation costs expected to be recognized in 2019 $ 1,400  
Weighted average expected volatility 52.50%  
Weighted average discount rates 2.22%  
Expected lives 6 years  
Weighted average remaining contractual term for total outstanding stock options 9 years 328 days  
Employee Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock authorized for grant under the Share Incentive Plans 300,000  
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date 85.00%  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Adjustments to Additional Paid in Capital, Other $ 2,700  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 120,693  
Weighted average values of grants $ 12.50  
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock and restricted stock units vesting period 1 year  
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock and restricted stock units vesting period 4 years  
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average values of grants $ 6.41  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 12.50  
Employee Stock Option [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock and restricted stock units vesting period 1 year  
Employee Stock Option [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock and restricted stock units vesting period 4 years  
SEACOR Holdings Inc. [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Additional compensation expense $ 1,700  
SEACOR Holdings Inc. [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Additional compensation expense $ 600