Vendor and customer rebates and allowances.

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Accrued customer rebates and allowances as of the balance sheet date.

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Rebates and allowances receivable from the vendor as of the balance sheet date.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Fixed interest rate related to the interest rate derivative.

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Fair value as of the balance sheet date of all derivative assets not designated as hedging instruments.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Fair value portion of notes payable.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Mar. 31, 2016	Feb. 16, 2016
Vendor and Customer Rebates and Allowances [Abstract]
Vendor rebates and allowances	$ 7,000	$ 5,700		$ 5,700		$ 7,000
Customer Rebates and Allowances	31,600	45,800		45,800		31,600
Operating Leases, Rent Expense, Net [Abstract]
Rental expense		4,800	$ 4,600	14,400	$ 13,500
Interest Rate Derivatives [Abstract]
Long-term Debt	437,629	438,033		438,033		$ 437,629
Repayments of Term Loan				410,400	$ 602,096
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				13.00%		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	367,500		367,500		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	3,700		3,700		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	$ 131,500		$ 131,500		$ 78,100