| Property, plant, and equipment, net |
Property, plant and equipment, net, as of December 31, 2014 and 2013, were as follows (in thousands): | | | | | | | | | | | | Useful Life (in years) | | December 31,
2014 | | December 31,
2013 | Land | N/A | | $ | 5,282 |
| | $ | 6,015 |
| Construction in progress | N/A | | 77,551 |
| | 6,443 |
| Base gas | N/A | | 1,108 |
| | 1,108 |
| Buildings and improvements | 4 to 40 | | 6,905 |
| | 5,109 |
| Processing and treating plants | 8 to 40 | | 80,141 |
| | 97,106 |
| Pipelines | 5 to 40 | | 452,180 |
| | 239,865 |
| Compressors | 4 to 20 | | 24,227 |
| | 11,955 |
| Dock | 20 to 40 | | 8,072 |
| | 7,942 |
| Tanks, truck rack and piping | 20 to 40 | | 30,079 |
| | 22,432 |
| Equipment | 8 to 20 | | 8,952 |
| | 6,294 |
| Computer software | 5 | | 3,520 |
| | 3,531 |
| Total property, plant and equipment | | | 698,017 |
| | 407,800 |
| Accumulated depreciation | | | (115,835 | ) | | (95,099 | ) | Property, plant and equipment, net | | | $ | 582,182 |
| | $ | 312,701 |
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