Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net income	$ 34,793	$ 20,651
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,341	8,704
Debt discount amortization		5,450
Stock-based compensation	1,797	1,693
Deferred income taxes	(346)
Loss on disposal of property, plant and equipment	220	16
Other non-cash adjustments	(337)	(314)
Changes in operating assets and liabilities:
Accounts receivable	(24,411)	(19,654)
Inventories	2,557	15,459
Prepaid expenses and other assets	482	185
Accounts payable	3,859	1,692
Accrued expenses and other liabilities	(4,080)	2,129
Income taxes receivable/payable	265	(64)
Net cash provided by operating activities	23,140	35,947
Investing Activities
Expenditures for property, plant and equipment	(5,110)	(2,938)
Proceeds from sales of property, plant and equipment	174
Purchase of acquired company, net of cash acquired		(11)
Notes receivable, net	63	57
Net cash used in investing activities	(4,873)	(2,892)
Financing Activities
Financing costs	(73)	(750)
Restricted cash		(8,938)
Borrowings under line of credit	74,500	77,700
Principal payments under line of credit	(79,500)	(52,700)
Repurchases of common stock	(3,153)	(2,784)
Proceeds from employee stock purchase and option plans	3,383	462
Net cash provided by (used in) financing activities	(4,843)	12,990
Net increase in cash and cash equivalents	13,424	46,045
Cash and cash equivalents at beginning of period	2,159	4,526
Cash and cash equivalents at end of period	15,583	50,571
Supplemental Disclosure:
Cash paid for interest, net of capitalized interest	344	2,931
Cash paid for income taxes, net	$ 375	$ 293