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Long Term Water Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Tangible water assets | Costs assigned to water assets held for future use were as follows ($ in thousands):
| December 31, 2017 |  | December 31, 2016
Banked water and water for future delivery | $ | 5,220 |  |  | $ | 4,779 |
Transferable water | 13,351 |  |  | 9,075 |
Total water held for future use at cost | $ | 18,571 |  |  | $ | 13,854 |
Schedule of finite-lived intangible assets | The Company's carrying amounts of its purchased water contracts were as follows: ($ in thousands):
| December 31, 2017 |  | December 31, 2016
| Costs |  | Accumulated Depreciation |  | Costs |  | Accumulated Depreciation
Dudley Ridge water rights | $ | 12,203 |  |  | $ | (3,377 | ) |  | $ | 12,203 |  |  | $ | (2,895 | )
Nickel water rights | 18,740 |  |  | (2,678 | ) |  | 18,740 |  |  | (2,218 | )
Tulare Lake Basin water rights | 5,857 |  |  | (2,186 | ) |  | 5,857 |  |  | (1,777 | )
| $ | 36,800 |  |  | $ | (8,241 | ) |  | $ | 36,800 |  |  | $ | (6,890 | )
Net cost of purchased water contracts | 28,559 |  |  |  |  | 29,910 |  |  |
Total cost water held for future use | 18,571 |  |  |  |  | 13,854 |  |  |
Net investments in water assets | $ | 47,130 |  |  |  |  | $ | 43,764 |  |  |
Components of water assets | Total water resources both recurring and one-time usage:
(in acre feet, unaudited) | December 31, 2017 |  | December 31, 2016
Water held for future use |  |  |
AVEK water bank | 13,033 |  |  | 13,033 |
Company water bank | 31,497 |  |  | 17,287 |
AVEK water for future delivery | — |  |  | 2,362 |
Transferable water * | 6,169 |  |  | 9,062 |
Total water held for future use | 50,699 |  |  | 41,744 |
Purchased water contracts |  |  |
Water Contracts (Dudley-Ridge, Nickel and Tulare) | 10,137 |  |  | 10,137 |
WRMWSD - Contracts with Company | 15,547 |  |  | 15,547 |
TCWD - Contracts with Company | 5,749 |  |  | 5,749 |
TCWD - Banked water contracted to Company | 49,184 |  |  | 33,390 |
Total purchased water contracts | 80,617 |  |  | 64,823 |
Total water held for future use and purchased water contracts | 131,316 |  |  | 106,567 |
*of the 6,169 acre-feet of transferable water, 1,452 acre-feet will be returned by AVEK to the Company at a 1.5 to 1 factor giving the Company use of a total of 2,137 (1,452 X 1.5) acre-feet as of December 31, 2017.

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- Definition Tabular disclosure of long lived assets held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets held for sale, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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