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INTANGIBLE ASSETS | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | INTANGIBLE ASSETS The following is a summary of changes in intangible assets related to favorable sales contracts acquired in business combinations for the years ended December 31, 2018 and December 31, 2017:
| December 31, |  | December 31,
Sales Contracts | 2018 |  | 2017
Cost |  |  |
Balance at beginning of period | $ | 10,599 |  |  | $ | 15,034 |
Sales contracts fulfilled | (10,599 | ) |  | (4,435 | )
Balance, end of period | — |  |  | 10,599 |
Accumulated amortization, beginning of period | 8,097 |  |  | 9,235 |
Amortization of sales contracts | 2,502 |  |  | 3,297 |
Sales contracts fulfilled | (10,599 | ) |  | (4,435 | )
Accumulated amortization, end of period | — |  |  | 8,097 |
Net book value | $ | — |  |  | $ | 2,502 |
The sales contracts when acquired were recorded at their acquisition date fair value, which are the incremental cash flows available to the Company arising from above-market pricing of the contracts.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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