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Segment Data (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Data [Abstract]                      
Number of reportable segments | Segment                 2    
Revenues [Abstract]                      
Marine transportation                 $ 1,471,893 $ 1,663,090 $ 1,770,684
Diesel engine services                 298,780 484,442 795,634
Total revenues $ 435,650 $ 434,708 $ 441,582 $ 458,733 $ 484,138 $ 532,565 $ 543,156 $ 587,673 1,770,673 2,147,532 2,566,318
Segment profit (loss) 52,370 51,559 62,474 61,343 80,115 90,623 93,072 97,902 227,746 361,712 454,390
Total assets 4,303,499       4,152,281       4,303,499 4,152,281 4,137,614
Depreciation and amortization                 200,917 192,240 169,312
Capital expenditures                 231,066 345,475 355,144
Other segment disclosures [Abstract]                      
Interest expense (4,477) (4,507) (4,513) (4,193) (4,280) (4,449) (4,759) (5,250) (17,690) (18,738) (21,461)
Loss (gain) on disposition of assets 166 122 (94) (67) (426) 400 (91) (1,555) 127 (1,672) (781)
Other income (expense) 47 $ (120) $ 179 $ 135 9 $ 22 $ (303) $ 60 (291) (663) (345)
Details of "Other" total assets [Abstract]                      
Investment in affiliates 2,622       2,090       2,622 2,090  
Total assets 4,303,499       4,152,281       4,303,499 4,152,281 4,137,614
Reporting Segments [Member]                      
Revenues [Abstract]                      
Marine transportation                 1,471,893 1,663,090 1,770,684
Diesel engine services                 298,780 484,442 795,634
Other [Member]                      
Revenues [Abstract]                      
Segment profit (loss)                 (32,542) (32,051) (35,537)
Total assets 52,861       63,179       52,861 63,179 83,789
Depreciation and amortization                 3,793 3,944 3,830
Capital expenditures                 7,728 4,706 7,343
Other segment disclosures [Abstract]                      
General corporate expenses                 (14,966) (14,773) (14,896)
Interest expense                 (17,690) (18,738) (21,461)
Loss (gain) on disposition of assets                 (127) 1,672 781
Other income (expense)                 241 (212) 39
Profit (loss) from other segment                 (32,542) (32,051) (35,537)
Details of "Other" total assets [Abstract]                      
General corporate assets 50,239       61,089       50,239 61,089 81,250
Investment in affiliates 2,622       2,090       2,622 2,090 2,539
Total assets 52,861       63,179       52,861 63,179 83,789
Intersegment Eliminations [Member]                      
Revenues [Abstract]                      
Total revenues                 24,672 26,203 25,769
Segment profit (loss)                 2,467 2,620 2,577
Marine Transportation [Member] | Reporting Segments [Member]                      
Revenues [Abstract]                      
Segment profit (loss)                 257,102 374,842 429,864
Total assets 3,622,348       3,451,553       3,622,348 3,451,553 3,317,696
Depreciation and amortization                 184,291 175,798 154,019
Capital expenditures                 217,423 311,862 340,315
Details of "Other" total assets [Abstract]                      
Total assets 3,622,348       3,451,553       3,622,348 3,451,553 3,317,696
Diesel Engine Services [Member] | Reporting Segments [Member]                      
Revenues [Abstract]                      
Segment profit (loss)                 3,186 18,921 60,063
Total assets 628,290       637,549       628,290 637,549 736,129
Depreciation and amortization                 12,833 12,498 11,463
Capital expenditures                 5,915 28,907 7,486
Details of "Other" total assets [Abstract]                      
Total assets $ 628,290       $ 637,549       $ 628,290 $ 637,549 $ 736,129