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Leases | 12 Months Ended
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Dec. 31, 2014
Leases [Abstract] |
Leases | (7) Leases The Company and its subsidiaries currently lease various facilities and equipment under a number of cancelable and noncancelable operating leases. Lease agreements for barges have terms from one to 12 years expiring at various dates through 2020. Lease agreements for towing vessels chartered by the Company have terms from 30 days to five years expiring at various dates through 2018; however, approximately half of the towing vessel charter agreements are for terms of one year or less. Total rental expense for the years ended December 31, 2014, 2013 and 2012 was as follows (in thousands):
|  | 2014 |  |  | 2013 |  |  | 2012 |
Rental expense: |  |  |  |  |  |  |  |  |
Marine equipment — barges |  | $ | 19,780 |  |  | $ | 20,841 |  |  | $ | 23,835 |
Marine equipment — towing vessels |  |  | 136,331 |  |  |  | 124,877 |  |  |  | 97,428 |
Other buildings and equipment |  |  | 9,146 |  |  |  | 10,298 |  |  |  | 9,952 |
Rental expense |  | $ | 165,257 |  |  | $ | 156,016 |  |  | $ | 131,215 |
Future minimum lease payments under operating leases that have initial or remaining noncancelable lease terms in excess of one year at December 31, 2014 were as follows (in thousands):
|  | Land, Buildings |  |  | Marine Equipment |  |  |  |
|  | And Equipment |  |  | Barges |  |  | Towing Vessels |  |  | Total |
2015 |  | $ | 7,716 |  |  | $ | 13,930 |  |  | $ | 89,491 |  |  | $ | 111,137 |
2016 |  |  | 6,351 |  |  |  | 8,872 |  |  |  | 35,656 |  |  |  | 50,879 |
2017 |  |  | 5,761 |  |  |  | 7,473 |  |  |  | 17,746 |  |  |  | 30,980 |
2018 |  |  | 5,104 |  |  |  | 6,594 |  |  |  | 4,212 |  |  |  | 15,910 |
2019 |  |  | 3,523 |  |  |  | 3,567 |  |  |  | — |  |  |  | 7,090 |
Thereafter |  |  | 15,358 |  |  |  | 2,239 |  |  |  | — |  |  |  | 17,597 |
|  | $ | 43,813 |  |  | $ | 42,675 |  |  | $ | 147,105 |  |  | $ | 233,593 |

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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