Basis of Presentation (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) customer segment	Dec. 31, 2015 USD ($) customer segment	Dec. 31, 2014 USD ($)
Class of Stock [Line Items]
Number of reportable segments | segment									1	1
Allowance for doubtful accounts receivable	$ 400				$ 0				$ 400	$ 0
Number of customers exceeding threshold | customer									2	2
Net sales	295,096	$ 287,996	$ 286,850	$ 279,836	265,238	$ 259,437	$ 253,998	$ 248,774	$ 1,149,778	$ 1,027,447	$ 917,760
Vendor concentration									41.00%	44.00%	68.00%
Advertising expense									$ 101,200	$ 83,600	$ 81,100
Research and development expense									9,800	9,500	7,600
Interest paid									15,000	15,000	15,700
Income taxes paid									54,500	54,900	$ 60,400
Trade receivables, net	110,873				66,648				110,873	66,648
Other receivables	4,573				13,455				4,573	13,455
Total	115,446				80,103				$ 115,446	$ 80,103
Common stock
Class of Stock [Line Items]
Stock split, conversion ratio									4.2
Credit Concentration Risk [Member]
Class of Stock [Line Items]
Concentration risk, percentage									77.00%	77.00%
Customer One [Member] | Customer Concentration Risk [Member]
Class of Stock [Line Items]
Concentration risk, percentage									41.00%	46.00%	49.00%
Customer Two [Member] | Customer Concentration Risk [Member]
Class of Stock [Line Items]
Concentration risk, percentage									22.00%	24.00%	24.00%
Reimbursement Receivable [Member]
Class of Stock [Line Items]
Reimbursement receivables	3,800				3,500				$ 3,800	$ 3,500
Taxes Receivable [Member]
Class of Stock [Line Items]
Reimbursement receivables	$ 500				$ 9,500				500	9,500
Geographic Distribution, Domestic [Member]
Class of Stock [Line Items]
Net sales									1,109,300	990,500	$ 881,900
Geographic Distribution, Foreign [Member]
Class of Stock [Line Items]
Net sales									$ 40,500	$ 36,900	$ 35,900
Computer Equipment [Member] | Maximum [Member]
Class of Stock [Line Items]
Property, plant and equipment, useful life									3 years
Furniture and Fixtures [Member] | Maximum [Member]
Class of Stock [Line Items]
Property, plant and equipment, useful life									10 years
Machinery and Equipment [Member] | Maximum [Member]
Class of Stock [Line Items]
Property, plant and equipment, useful life									15 years
Machinery and Equipment [Member] | Minimum [Member]
Class of Stock [Line Items]
Property, plant and equipment, useful life									7 years
Land, Buildings and Improvements [Member] | Maximum [Member]
Class of Stock [Line Items]
Property, plant and equipment, useful life									40 years
Computer Software, Intangible Asset [Member] | Maximum [Member]
Class of Stock [Line Items]
Finite-lived intangible asset, useful life									5 years