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REVENUE RECOGNITION, Contract Liabilities - Customer Loyalty Programs (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2018 | Dec. 31, 2017
REVENUE RECOGNITION [Abstract] |  |  |
Outstanding at beginning of period | [1] | $ 13,043 |
Increase (decrease) attributed to [Abstract] |  |  |
Customer loyalty deferrals |  | 2,090 |
Customer loyalty redemptions/expirations |  | (1,497) |
Outstanding at end of period |  | $ 13,636 |
Loyalty point liability under cost provision methodology |  |  | $ 1,900
[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 to the cumulative impact of adopting Topic 606.

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- Definition Amount of increase in obligation to transfer good or service to customer for which consideration has been received or is receivable from loyalty point program deferrals with certain customers. + References No definition available. + Details
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- Definition Amount of decrease in obligation to transfer good or service to customer for which consideration has been received or is due from redemptions and expirations of loyalty point program deferrals with certain customers. + References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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