Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

v3.5.0.2
Commitments And Contingencies (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2013
claim
Dec. 31, 2012
claim
Dec. 31, 2010
claim
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
equipment
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           $ 74,963,000
Unrecorded Unconditional Purchase Obligation, Due in Second Years           91,927,000
Unrecorded Unconditional Purchase Obligation, Due in Third Year           47,374,000
Unrecorded Unconditional Purchase Obligation Due in Fourth Year           12,554,000
Unrecorded Unconditional Purchase Obligation           $ 226,818,000
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        
Offshore Support Vessels Fast Support [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           9
Offshore Support Vessels Supply [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity           0
Wind Farm Utility Vessel [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           1
U.S.-flag Product Tankers [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           2
U.S. Flag Articulated Tug-Barge [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           1
U.S.-flag Harbor Tugs [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           2
Inland River Dry Cargo Barges [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity           38
Inland River Towboats [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Maximum Quantity | equipment           3
Offshore Marine Services [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           $ 12,622,000
Unrecorded Unconditional Purchase Obligation, Due in Second Years           38,366,000
Unrecorded Unconditional Purchase Obligation, Due in Third Year           47,374,000
Unrecorded Unconditional Purchase Obligation Due in Fourth Year           12,554,000
Unrecorded Unconditional Purchase Obligation           110,916,000
Offshore Marine Services [Member] | Offshore Support Vessels Supply [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Contingent Upon a Third Party Option           $ 15,400,000
Unrecorded Unconditional Purchase Obligation, Contingent Upon a Third Party Option, Maximum Quantity           1
Shipping Services [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           $ 43,482,000
Unrecorded Unconditional Purchase Obligation, Due in Second Years           26,096,000
Unrecorded Unconditional Purchase Obligation, Due in Third Year           0
Unrecorded Unconditional Purchase Obligation Due in Fourth Year           0
Unrecorded Unconditional Purchase Obligation           69,578,000
Inland River Services [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           17,572,000
Unrecorded Unconditional Purchase Obligation, Due in Second Years           27,465,000
Unrecorded Unconditional Purchase Obligation, Due in Third Year           0
Unrecorded Unconditional Purchase Obligation Due in Fourth Year           0
Unrecorded Unconditional Purchase Obligation           45,037,000
Illinois Corn Processing LLC [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year           1,287,000
Unrecorded Unconditional Purchase Obligation, Due in Second Years           0
Unrecorded Unconditional Purchase Obligation, Due in Third Year           0
Unrecorded Unconditional Purchase Obligation Due in Fourth Year           0
Unrecorded Unconditional Purchase Obligation           $ 1,287,000
Subsequent Event [Member]            
Loss Contingencies [Line Items]            
Unrecorded Unconditional Purchase Obligation         $ 18,000,000