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Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Number2	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Number2	Mar. 31, 2016 USD ($)	Feb. 16, 2016 USD ($)
Vendor and Customer Rebates and Allowances [Abstract]
Vendor rebates and allowances	$ 3,900		$ 3,900		$ 7,700
Customer Rebates and Allowances	32,200		32,200		27,700
Operating Leases, Rent Expense, Net [Abstract]
Rental expense	4,500	$ 4,500	8,900	$ 9,000
Interest Rate Derivatives [Abstract]
Long-term debt	464,586		$ 464,586		$ 344,589
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Top Two Customers [Member]
Risks and Uncertainties [Abstract]
Concentration risk number of customers | Number2			2		2
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Top Two Customers [Member]
Risks and Uncertainties [Abstract]
Concentration of credit risk			12.00%		10.00%
Medium-term notes [Member] | Term Loans Due 2022 and 2026 [Member]
Interest Rate Derivatives [Abstract]
Long-term debt	125,000		$ 125,000
Interest Rate Swap - $50 million notional amount fixed at 1.007% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Interest rate swaps, notional amounts							$ 50,000
Interest rate swaps, fixed interest rate							1.007%
Interest Rate Swap - $75 million notional amount fixed at 1.256% [Member] | Not Designated as Hedging Instrument [Member]
Interest Rate Derivatives [Abstract]
Interest rate swaps, notional amounts						$ 75,000
Interest rate swaps, fixed interest rate						1.256%
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
6.375% senior notes, book value	300,000		300,000		$ 300,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
6.375% senior notes, book value	306,000		306,000		309,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other long-term liabilities [Member]
Interest Rate Derivatives [Abstract]
Fair value of interest rate swap agreements, Liability	1,600		1,600
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Money market funds, fair value	$ 69,400		$ 69,400		$ 170,200

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