Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) customer segment	Dec. 31, 2014 USD ($) customer segment	Dec. 31, 2013 USD ($)
Class of Stock [Line Items]
Net sales	$ 265,238	$ 259,437	$ 253,998	$ 248,774	$ 238,089	$ 234,770	$ 218,654	$ 226,247		$ 1,027,447	$ 917,760	$ 719,509
Write off of Deferred Debt Issuance Cost									$ 9,200
Amortization of Deferred Charges										$ 100	$ 100	$ 1,600
Vendor Concentration										44.00%	68.00%	69.00%
Advertising Expense										$ 83,600	$ 81,100	$ 57,700
Research and Development Expense										9,500	7,600	4,600
Interest Paid										15,000	15,700	20,000
Income Taxes Paid										54,900	60,400	50,400
Amortization of debt issuance costs and accretion of original issue discount										122	122	$ 2,511
Restricted Cash and Cash Equivalents	500				500					500	500
Trade receivables, net	66,648				54,647					66,648	54,647
Other receivables	13,455				23,973					13,455	23,973
Total	80,103				78,620					$ 80,103	$ 78,620
Number of Customers Exceeding Threshold | customer										2	2
Number of Reportable Segments | segment										1	1
Common stock
Class of Stock [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio										4.2
Credit Concentration Risk [Member]
Class of Stock [Line Items]
Concentration Risk, Percentage										69.00%	72.00%
Customer One [Member] | Customer Concentration Risk [Member]
Class of Stock [Line Items]
Concentration Risk, Percentage										46.00%	49.00%	53.00%
Customer Two [Member] | Customer Concentration Risk [Member]
Class of Stock [Line Items]
Concentration Risk, Percentage										24.00%	24.00%	22.00%
Reimbursement Receivable [Member]
Class of Stock [Line Items]
Reimbursement receivables	3,500				4,400					$ 3,500	$ 4,400
Taxes Receivable [Member]
Class of Stock [Line Items]
Reimbursement receivables	$ 9,500				$ 18,200					9,500	18,200
Geographic Distribution, Domestic [Member]
Class of Stock [Line Items]
Net sales										990,500	881,900	$ 694,400
Geographic Distribution, Foreign [Member]
Class of Stock [Line Items]
Net sales										$ 36,900	$ 35,900	$ 25,100