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REVENUE RECOGNITION (Tables) | 6 Months Ended
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Jun. 30, 2018
REVENUE RECOGNITION [Abstract] |
Changes in Contract Liabilities - Customer Loyalty Programs | Significant changes in these contract liability balances were as follows for the six-month period ended June 30 (U.S. dollars in thousands):
|  | June 30, 2018 |
Outstanding at beginning of period |  | $ | 13,043 | (1)
Increase (decrease) attributed to: |  |  |  |
Customer loyalty deferrals |  |  | 3,029 |
Customer loyalty redemptions/expirations |  |  | (1,802 | )
Outstanding at end of period |  | $ | 14,270 |
(1) | The company recorded customer loyalty points under the cost provision method prior to the adoption of Topic 606. The loyalty point liability under the cost provision methodology was $1.9 million as of December 31, 2017. The Company recorded an additional liability of $11.2 million due to the cumulative impact of adopting Topic 606.

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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