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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2015
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | 5. Property, Plant and Equipment, net Property, plant and equipment, net, consisted of the following (in thousands):
| December 31,
| 2015 |  | 2014
Compression equipment, facilities and other fleet assets | $ | 3,292,364 |  |  | $ | 3,401,594 |
Land and buildings | 53,175 |  |  | 51,391 |
Transportation and shop equipment | 108,998 |  |  | 103,207 |
Other | 109,291 |  |  | 84,382 |
| 3,563,828 |  |  | 3,640,574 |
Accumulated depreciation | (1,296,040 | ) |  | (1,268,493 | )
Property, plant and equipment, net | $ | 2,267,788 |  |  | $ | 2,372,081 |
Depreciation expense was $212.0 million, $200.0 million and $180.7 million during the years ended December 31, 2015, 2014 and 2013, respectively. Assets under construction of $71.1 million and $82.6 million were primarily included in compression equipment, facilities and other fleet assets at December 31, 2015 and 2014, respectively. We capitalized $0.3 million, $0.2 million and $0.3 million of interest related to construction in process during the years ended December 31, 2015, 2014 and 2013, 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=64827811&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=64862545&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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