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REVENUE RECOGNITION, Contract Liabilities - Customer Loyalty Programs (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Contract Liabilities - Customer Loyalty Programs [Abstract]
Outstanding at beginning of period	$ 13,043	[1]
Increase (Decrease) Attributed to [Abstract]
Customer loyalty deferrals	3,029
Customer loyalty redemptions/expirations	(1,802)
Outstanding at end of period	14,270
Calculated under Cost Provision Methodology [Member]
Contract Liabilities - Customer Loyalty Programs [Abstract]
Outstanding at beginning of period	1,900
Impact of Adopting ASC Topic 606 [Member]
Contract Liabilities - Customer Loyalty Programs [Abstract]
Outstanding at beginning of period	$ 11,200
[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

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.

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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

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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://fasb.org/us-gaap/role/ref/legacyRef
-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 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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