Condensed Consolidated Statements of Cash Flows [Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 55,340	$ 33,039
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	20,301	21,836
Stock-based compensation expense	5,906	4,289
Provision for deferred income taxes	(13,788)	(278)
Net provision for doubtful accounts	438	220
Gain on sale of a business	(33,974)
Gain on sale of assets	(1,230)	(323)
Excess tax benefit from stock-based compensation	(903)
Change in assets and liabilities:
Increase in receivables	(38,919)	(18,442)
(Increase) decrease in inventories	(8,480)	4,055
Increase in other assets	(6,813)	(199)
Increase (decrease) in accounts payable	12,029	(1,237)
Increase in accrued liabilities and other	4,783	935
Net cash (used in) provided by operating activities	(5,310)	43,895
Cash flows from investing activities:
Capital expenditures	(56,727)	(37,417)
Proceeds from sale of property, plant and equipment	2,526	590
Proceeds from sale of a business	89,167
Net cash provided by (used in) investing activities	34,966	(36,827)
Cash flows from financing activities:
Borrowings on lines of credit	51,787	159,612
Payments on lines of credit	(45,170)	(158,679)
Other financing activities	(30)	(39)
Proceeds from employee stock plans	922	6,928
Purchase of treasury stock	(47,450)	(2,010)
Excess tax benefit from stock-based compensation	903
Net cash (used in) provided by financing activities	(39,038)	5,812
Effect of exchange rate changes on cash	295	(1,681)
Net (decrease) increase in cash and cash equivalents	(9,087)	11,199
Cash and cash equivalents at beginning of year	65,840	46,846
Cash and cash equivalents at end of period	56,753	58,045
Cash paid for:
Income taxes (net of refunds)	36,243	14,471
Interest	$ 4,870	$ 4,485