XML 64 R53.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments And Contingencies (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2013
claim
Dec. 31, 2012
claim
Dec. 31, 2010
claim
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
equipment
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           $ 6,266
Unrecorded Unconditional Purchase Obligation, Due in Second Years           3,389
Unrecorded Unconditional Purchase Obligation, Due in Third Year           529
Unrecorded Unconditional Purchase Obligation           $ 10,184
Multi-district Litigation [Member]            
Loss Contingencies [Line Items]            
Claims Filed | claim       1    
Loss Contingency, Number of Plaintiffs 11          
Abney Litigation [Member]            
Loss Contingencies [Line Items]            
Claims Filed | claim     668      
Abood Litigation [Member]            
Loss Contingencies [Line Items]            
Claims Filed | claim   174        
U.S.-flag Harbor Tugs [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           2
Short-sea Container/RORO Vessels [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           1
Shipping Services [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           $ 4,689
Unrecorded Unconditional Purchase Obligation, Due in Second Years           2,252
Unrecorded Unconditional Purchase Obligation, Due in Third Year           0
Unrecorded Unconditional Purchase Obligation           6,941
Inland River Services [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           1,577
Unrecorded Unconditional Purchase Obligation, Due in Second Years           1,137
Unrecorded Unconditional Purchase Obligation, Due in Third Year           529
Unrecorded Unconditional Purchase Obligation           $ 3,243
Subsequent Event [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation         $ 2,600