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Revenue Recognition - Summary of Impact of Adoption of the New Standard to Previously Reported Selected Financial Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Gross revenues		$ 107,660		$ 323,428
Net revenues		107,660		323,428
Operating income	$ 9,723	2,389	$ 45,499	10,285
Net income	$ (3,124)	8,555	$ 4,400	15,610
Accounting Standards Update 2014-09 | As Reported
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Gross revenues		113,748		342,045
Promotional allowances		(5,426)		(16,584)
Net revenues		108,322		325,461
Operating income		2,389		10,285
Net income		8,555		15,610
Accounting Standards Update 2014-09 | Adjustments
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Gross revenues		(6,088)		(18,617)
Promotional allowances		5,426		16,584
Net revenues		$ (662)		$ (2,033)

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