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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Mar. 31, 2016 | Feb. 16, 2016
Vendor and Customer Rebates and Allowances [Abstract] |  |  |  |  |  |  |  |
Vendor rebates and allowances | $ 7,000 | $ 5,300 |  | $ 5,300 |  | $ 7,000 |  |
Customer Rebates and Allowances | 31,600 | 46,000 |  | 46,000 |  | 31,600 |  |
Operating Leases, Rent Expense, Net [Abstract] |  |  |  |  |  |  |  |
Rental expense |  | 4,800 | $ 4,500 | 9,500 | $ 8,900 |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |  |
Long-term Debt | 437,629 | 438,200 |  | 438,200 |  | $ 437,629 |  |
Repayments of Term Loan |  |  |  | 366,400 | $ 232,700 |  |  |
Retained Earnings [Member] | ASU 2016-09 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |
New Accounting Pronouncement, Cumulative Effect of Change on Equity |  | 100 |  | $ 100 |  |  |  |
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer One [Member] |  |  |  |  |  |  |  |
Risks and Uncertainties [Abstract] |  |  |  |  |  |  |  |
Concentration of credit risk |  |  |  | 13.00% |  | 11.00% |  |
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Customer Two [Member] |  |  |  |  |  |  |  |
Risks and Uncertainties [Abstract] |  |  |  |  |  |  |  |
Concentration of credit risk |  |  |  | 15.00% |  | 12.00% |  |
Medium-term notes [Member] | Term Loans Due 2022 and 2026 [Member] |  |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |  |
Long-term Debt |  | 125,000 |  | $ 125,000 |  |  |  |
Medium-term notes [Member] | Term Loans Due 2022 and 2026 [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |  |
Long-term Debt | 95,000 | 95,000 |  | 95,000 |  | $ 95,000 |  |
Medium-term notes [Member] | Term Loan Due 2026 [Member] |  |  |  |  |  |  |  |
Interest Rate Derivatives [Abstract] |  |  |  |  |  |  |  |
Long-term Debt | 45,000 | 45,000 |  | 45,000 |  | 45,000 |  |
Repayments of Term Loan | 30,000 |  |  |  |  |  |  |
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 | 350,000 | 350,000 |  | 350,000 |  | 350,000 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] |  |  |  |  |  |  |  |
Senior notes, book value | 347,400 | 359,600 |  | 359,600 |  | 347,400 |  |
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 | 4,200 | 3,800 |  | 3,800 |  | 4,200 |  |
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 | $ 78,100 | $ 74,700 |  | $ 74,700 |  | $ 78,100 |  |

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