Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities
Net income	$ 36,368	$ 19,495
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,449	12,444
Deferred income taxes		(2,991)
Stock-based compensation	3,672	2,781
Loss on disposal of property, plant and equipment	169	587
Excess tax benefits from stock compensation	(12,677)	(2,567)
Other non-cash adjustments	(245)	(337)
Changes in operating assets and liabilities:
Accounts receivable	(7,698)	2,543
Inventories	7,789	6,343
Prepaid expenses and other assets	(415)	447
Accounts payable	(2,027)	(4,488)
Accrued expenses and other liabilities	(3,690)	16,775
Income taxes receivable/payable	12,630	2,633
Net cash provided by operating activities	45,325	53,665
Investing Activities
Expenditures for property, plant and equipment	(8,794)	(8,971)
Proceeds from sales of property, plant and equipment	48	176
Purchase of acquired company, net of cash acquired	(44)
Notes receivable, net	59	78
Net cash used in investing activities	(8,731)	(8,717)
Financing Activities
Financing costs		(73)
Borrowings under line of credit	139,000	74,500
Principal payments under line of credit	(136,000)	(79,500)
Repurchases of common stock	(52,892)	(28,445)
Proceeds from employee stock purchase and option plans	690	3,427
Excess tax benefits from stock compensation	12,677	2,567
Net cash used in financing activities	(36,525)	(27,524)
Net increase in cash and cash equivalents	69	17,424
Cash and cash equivalents at beginning of period	3,772	2,159
Cash and cash equivalents at end of period	3,841	19,583
Supplemental Disclosure:
Cash paid for interest, net of capitalized interest	498	348
Cash paid for income taxes, net	$ 9,342	$ 696