Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (7,732)	$ 78,832
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	32,668	30,925
Stock-based compensation expense	10,514	9,092
Provision for deferred income taxes	(12,240)	(5,277)
Net provision for doubtful accounts	$ 1,176	1,226
Gain on sale of a business		(33,974)
Gain on sale of assets	$ (940)	(1,351)
Excess tax benefit from stock-based compensation		(1,175)
Change in assets and liabilities:
(Increase) decrease in receivables	$ 120,848	(60,348)
(Increase) decrease in inventories	11,190	(11,973)
Increase in other assets	(2,384)	(6,170)
Increase (decrease) in accounts payable	(38,772)	7,531
Increase (decrease) in accrued liabilities and other	(7,161)	15,544
Net cash provided by operating activities	107,167	22,882
Cash flows from investing activities:
Capital expenditures	(51,375)	$ (84,710)
Increase in restricted cash	(15,500)
Proceeds from sale of property, plant and equipment	$ 1,864	$ 3,144
Proceeds from sale of a business		89,766
Net cash (used in) provided by investing activities	$ (65,011)	8,200
Cash flows from financing activities:
Borrowings on lines of credit	7,178	54,665
Payments on lines of credit	(9,928)	$ (58,897)
Debt issuance costs	(1,763)
Other financing activities	(1,695)	$ (43)
Proceeds from employee stock plans	469	3,104
Purchases of treasury stock	$ (1,771)	(52,892)
Excess tax benefit from stock-based compensation		1,175
Net cash used in financing activities	$ (7,510)	(52,888)
Effect of exchange rate changes on cash	(5,848)	(2,644)
Net increase (decrease) in cash and cash equivalents	28,798	(24,450)
Cash and cash equivalents at beginning of year	85,052	65,840
Cash and cash equivalents at end of period	113,850	41,390
Cash paid for:
Income taxes (net of refunds)	11,978	44,929
Interest	$ 4,720	$ 5,742