Condensed Consolidated Statements of Cash Flows [Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 78,832	$ 51,799
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	30,925	33,138
Stock-based compensation expense	9,092	6,954
Provision for deferred income taxes	(5,277)	(311)
Net provision for doubtful accounts	1,226	221
Gain on sale of a business	(33,974)
Gain on sale of assets	(1,351)	(437)
Excess tax benefit from stock-based compensation	(1,175)	(2,020)
Change in assets and liabilities:
(Increase) decrease in receivables	(60,348)	1,210
(Increase) decrease in inventories	(11,973)	2,964
(Increase) decrease in other assets	(6,170)	828
Increase (decrease) in accounts payable	7,531	(11,832)
Increase in accrued liabilities and other	15,544	13,175
Net cash provided by operating activities	22,882	95,689
Cash flows from investing activities:
Capital expenditures	(84,710)	(52,550)
Proceeds from sale of property, plant and equipment	3,144	1,248
Proceeds from sale of a business	89,766
Net cash provided by (used in) investing activities	8,200	(51,302)
Cash flows from financing activities:
Borrowings on lines of credit	54,665	215,994
Payments on lines of credit	(58,897)	(243,141)
Other financing activities	(43)	(25)
Proceeds from employee stock plans	3,104	8,102
Purchases of treasury stock	(52,892)	(4,227)
Excess tax benefit from stock-based compensation	1,175	2,020
Net cash used in financing activities	(52,888)	(21,277)
Effect of exchange rate changes on cash	(2,644)	(547)
Net (decrease) increase in cash and cash equivalents	(24,450)	22,563
Cash and cash equivalents at beginning of year	65,840	46,846
Cash and cash equivalents at end of period	41,390	69,409
Cash paid for:
Income taxes (net of refunds)	44,929	21,637
Interest	$ 5,742	$ 5,047