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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

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