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Property, Plant and Equipment | 3 Months Ended
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Mar. 31, 2016
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment The components of property, plant and equipment are as follows:
(in thousands) | March 31, 2016 |  | December 31, 2015 |  | March 31, 2015
Land | $ | 30,138 |  |  | $ | 29,928 |  |  | $ | 23,380 |
Land improvements and leasehold improvements | 77,531 |  |  | 77,191 |  |  | 73,651 |
Buildings and storage facilities | 304,276 |  |  | 303,482 |  |  | 274,877 |
Machinery and equipment | 377,879 |  |  | 375,028 |  |  | 340,109 |
Construction in progress | 47,755 |  |  | 32,871 |  |  | 18,354 |
| 837,579 |  |  | 818,500 |  |  | 730,371 |
Less: accumulated depreciation | 374,918 |  |  | 363,240 |  |  | 332,137 |
| $ | 462,661 |  |  | $ | 455,260 |  |  | $ | 398,234 |
Depreciation expense on property, plant and equipment was $12.1 million and $10.9 million for the three months ended March 31, 2016 and 2015, respectively. Capitalized software has been reclassified from property, plant, and equipment, and is now presented as a component of other intangible assets. Prior year balance sheets have been recast to conform with the current period presentation. Rail Group Assets The components of Rail Group assets leased to others are as follows:
(in thousands) | March 31, 2016 |  | December 31, 2015 |  | March 31, 2015
Rail Group assets leased to others | $ | 436,948 |  |  | $ | 434,051 |  |  | $ | 402,509 |
Less: accumulated depreciation | 99,287 |  |  | 95,940 |  |  | 89,414 |
| $ | 337,661 |  |  | $ | 338,111 |  |  | $ | 313,095 |
Depreciation expense on Rail Group assets leased to others amounted to $4.6 million and $4.0 million for the three months ended March 31, 2016 and 2015, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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