Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (3,261)	$ 55,340
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	21,069	20,301
Stock-based compensation expense	6,510	5,906
Provision for deferred income taxes	(3,205)	(13,788)
Net provision for doubtful accounts	$ 1,033	438
Gain on sale of a business		(33,974)
Gain on sale of assets	$ (528)	(1,230)
Excess tax benefit from stock-based compensation		(903)
Change in assets and liabilities:
(Increase) decrease in receivables	$ 113,746	(38,919)
(Increase) decrease in inventories	2,804	(8,480)
Increase in other assets	(2,461)	(6,813)
Increase (decrease) in accounts payable	(38,744)	12,029
Increase (decrease) in accrued liabilities and other	(15,166)	4,783
Net cash provided by (used in) operating activities	81,797	(5,310)
Cash flows from investing activities:
Capital expenditures	(34,313)	(56,727)
Proceeds from sale of property, plant and equipment	$ 1,144	2,526
Proceeds from sale of a business		89,167
Net cash (used in) provided by investing activities	$ (33,169)	34,966
Cash flows from financing activities:
Borrowings on lines of credit	4,718	51,787
Payments on lines of credit	(5,949)	$ (45,170)
Debt issuance costs	(1,697)
Other financing activities	(1,487)	$ (30)
Proceeds from employee stock plans	359	922
Purchases of treasury stock	$ (1,769)	(47,450)
Excess tax benefit from stock-based compensation		903
Net cash used in financing activities	$ (5,825)	(39,038)
Effect of exchange rate changes on cash	(4,598)	295
Net increase (decrease) in cash and cash equivalents	38,205	(9,087)
Cash and cash equivalents at beginning of year	85,052	65,840
Cash and cash equivalents at end of period	123,257	56,753
Cash paid for:
Income taxes (net of refunds)	9,137	36,243
Interest	$ 4,412	$ 4,870