CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
Net cash (used in) provided by operating activities	$ (9,463)	$ 18,327
Cash flows from investing activities:
Capital expenditures	(15,095)	(48,724)
Grants received for capital expenditures		236
Proceeds from sale of business		20,500
Proceeds from sale of assets	929
Net cash used in investing activities	(14,166)	(27,988)
Cash flows from financing activities:
Net payments of commercial paper	(29,200)	(5,650)
Borrowings under credit agreements	53,500	3,000
Payments under credit agreements		(3,000)
Proceeds from stock option exercises	104
Dividends paid	(1,481)	(1,479)
Net cash provided by (used in) financing activities	22,923	(7,129)
Net decrease in cash and cash equivalents	(706)	(16,790)
Cash and cash equivalents, beginning of period	4,044	26,661
Cash and cash equivalents, end of period	$ 3,338	$ 9,871