Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 41,521us-gaap_NetIncomeLoss	$ 34,598us-gaap_NetIncomeLoss	$ 2,720us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,204	16,255	17,009
Debt discount amortization			5,450
Deferred income taxes	3,574us-gaap_DeferredIncomeTaxExpenseBenefit	(12,698)us-gaap_DeferredIncomeTaxExpenseBenefit	618us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	4,807us-gaap_ShareBasedCompensation	3,811us-gaap_ShareBasedCompensation	3,469us-gaap_ShareBasedCompensation
Loss on disposal of property, plant and equipment	158	587	1,909
Excess tax benefits from stock compensation	(12,898)	(1,466)
Other non-cash adjustments	(245)us-gaap_OtherNoncashIncomeExpense	(337)us-gaap_OtherNoncashIncomeExpense	(314)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
Accounts receivable	867	(10,844)	2,660
Inventories	(1,319)us-gaap_IncreaseDecreaseInInventories	(4,907)us-gaap_IncreaseDecreaseInInventories	11,376us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(624)	(213)	(405)
Accounts payable	5,159	3,731	(731)
Accrued expenses and other liabilities	(7,535)	15,173	16,784
Income taxes receivable/payable	9,973	1,518	(102)
Net cash provided by operating activities	58,642	45,208	60,443
Investing Activities
Expenditures for property, plant and equipment	(12,974)	(13,060)	(7,593)
Proceeds from sales of property, plant and equipment	66	176	3
Purchase of acquired company, net of cash acquired	(44)		(11)
Notes receivable, net	79	187	117
Net cash used in investing activities	(12,873)	(12,697)	(7,484)
Financing Activities
Financing costs	(453)us-gaap_PaymentsOfFinancingCosts	(119)us-gaap_PaymentsOfFinancingCosts	(750)us-gaap_PaymentsOfFinancingCosts
Restricted cash			37,000
Borrowings under line of credit	143,000us-gaap_ProceedsFromLinesOfCredit	74,500us-gaap_ProceedsFromLinesOfCredit	93,700us-gaap_ProceedsFromLinesOfCredit
Principal payments under line of credit	(143,000)us-gaap_RepaymentsOfLinesOfCredit	(79,500)us-gaap_RepaymentsOfLinesOfCredit	(88,700)us-gaap_RepaymentsOfLinesOfCredit
Principal payments under mortgages and notes			(91,875)us-gaap_RepaymentsOfLongTermDebt
Repurchases of common stock	(53,189)	(31,277)	(5,522)
Proceeds from employee stock purchase and option plans	747	4,032	821
Excess tax benefits from stock compensation	12,898	1,466
Net cash used in financing activities	(39,997)	(30,898)	(55,326)
Net increase (decrease) in cash and cash equivalents	5,772	1,613	(2,367)
Cash and cash equivalents at beginning of year	3,772	2,159	4,526
Cash and cash equivalents at end of year	9,544	3,772	2,159
Supplemental disclosures of cash flow information:
Cash paid for interest, net of capitalized interest	520us-gaap_InterestPaidNet	348us-gaap_InterestPaidNet	5,792us-gaap_InterestPaidNet
Cash paid for income taxes, net	$ 11,919us-gaap_IncomeTaxesPaidNet	$ 672us-gaap_IncomeTaxesPaidNet	$ 590us-gaap_IncomeTaxesPaidNet

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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