Annual report pursuant to Section 13 and 15(d)

Savings, Multi-Employer And Defined Benefit Pension Plans (Details)

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Savings, Multi-Employer And Defined Benefit Pension Plans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]          
Employer matching contribution percent of employees' gross pay   3.50%      
Defined contribution plan, cost   $ 2,200 $ 2,000 $ 1,800  
Deferred compensation arrangement with individual, maximum annual salary deferral, percentage   75.00%      
Deferred compensation arrangement with individual, maximum cash bonus deferral, percentage   100.00%      
Deferred compensation obligation   $ 800 600    
ISH Retirement Plan          
Defined Benefit Plan Disclosure [Line Items]          
Pension expense (income) $ 1,300 (500) (900)    
Defined Benefit Plan [Abstract]          
Fair Value of Assets   37,723 34,923    
Projected Benefit Obligation   (37,583) (34,299)    
Funded Status   $ 140 $ 624    
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]          
Benefit obligation, Discount rate   3.10% 4.05%    
Benefit obligation, CPI   2.25% 2.25%    
Benefit obligation, Cash balance interest credits (compounded annually)   4.00% 4.00%    
Net periodic benefit cost, Expected long-term rate of return on plan assets   6.00% 6.75%    
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]          
2020   $ 2,250      
2021   2,120      
2022   2,200      
2023   2,180      
2024   2,160      
American Maritime Officers Pension Plan | Withdrawal from Multiemployer Defined Benefit Plan          
Defined Benefit Plan Disclosure [Line Items]          
Loss contingency, estimate of possible loss         $ 28,100
Multiemployer Plans, Pension          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer plan, contributions by employer   2,600 $ 2,500 2,400  
Multiemployer Plans, Postretirement Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Multiemployer plan, contributions by employer   $ 1,100 $ 1,000 $ 1,000