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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2015
Property Plant And Equipment [Abstract] |
Property, Plant and Equipment | 5. Property, Plant and Equipment
|  | Useful lives in |  |  | December 31, |
|  | years |  |  | 2015 |  |  | 2014 |
|  |  |  |  |  | (In Thousands) |
Machinery, equipment and automotive |  | 3 - 30 |  |  | $ | 589,098 |  |  | $ | 360,222 |
Proved natural gas properties |  | * |  |  |  | 76,277 |  |  |  | 72,529 |
Buildings and improvements |  | 10 - 30 |  |  |  | 62,426 |  |  |  | 55,975 |
Furniture, fixtures and store equipment |  | 3 - 10 |  |  |  | 6,399 |  |  |  | 6,492 |
Assets under capital leases |  |  | 3 |  |  |  | 425 |  |  |  | 240 |
Land improvements |  | 10 - 40 |  |  |  | 7,433 |  |  |  | 7,125 |
Construction in progress |  | N/A |  |  |  | 507,287 |  |  |  | 292,324 |
Capital spare parts |  | N/A |  |  |  | 18,047 |  |  |  | 8,722 |
Land |  | N/A |  |  |  | 9,780 |  |  |  | 9,780 |
|  |  |  |  |  |  | 1,277,172 |  |  |  | 813,409 |
Less accumulated depreciation, depletion and amortization |  |  |  |  |  |  | 271,684 |  |  |  | 194,204 |
|  |  |  |  |  | $ | 1,005,488 |  |  | $ | 619,205 |
Machinery, equipment and automotive primarily includes the categories of property and equipment and estimated useful lives as follows: chemical processing plants and plant infrastructure (15-30 years); production, fabrication, and assembly equipment (7-15 years) used in our Climate Control Business; certain processing plant components (3-10 years); and trucks, automobiles, trailers, and other rolling stock (3-7 years). At December 31, 2015 and 2014, assets capitalized under capital leases consist of machinery and equipment. Accumulated amortization for assets capitalized under capital leases were $98,000 and $28,000 at December 31, 2015 and 2014, respectively. During 2015 and 2014, interest cost capitalized in PP&E was $30,348,000 and $13,586,000, respectively.
* | See information concerning natural gas properties included in PP&E in Note 1- Summary of Significant Accounting Policies.

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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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