Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Changes in Contract Liabilities (Details)

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Revenue Recognition - Changes in Contract Liabilities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Change in Contract with Customer, Liability [Roll Forward]  
Outstanding at December 31, 2017 $ 1,126
Increase (decrease) attributed to:  
Customer loyalty net deferrals 2,692
Customer loyalty redemptions (2,392)
Outstanding at June 30, 2018 $ 1,426