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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Mar. 31, 2016 | Feb. 16, 2016
Vendor and Customer Rebates and Allowances [Abstract] |  |  |  |  |  |  |
Vendor rebates and allowances | $ 5,900 |  | $ 5,900 |  | $ 7,700 |  |
Customer Rebates and Allowances | 34,400 |  | 34,400 |  | 27,700 |  |
Operating Leases, Rent Expense, Net [Abstract] |  |  |  |  |  |  |
Rental expense | 4,600 | $ 4,800 | 13,500 | $ 13,800 |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Long-term debt | 467,232 |  | $ 467,232 |  | $ 344,589 |  |
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] |  |  |  |  |  |  |
Senior notes, book value | 465,500 |  | 465,500 |  | $ 300,000 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |  |  |  |  |
Senior notes, book value | 474,600 |  | 474,600 |  | 309,000 |  |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member] |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |
Fair value of interest rate swap agreements, Asset | 44 |  | 44 |  |  |  |
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 | 809 |  | 809 |  |  |  |
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 | $ 98,400 |  | $ 98,400 |  | $ 170,200 |  |

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