Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net income (loss)	$ (5,148)	$ 9,569
Adjustments to reconcile from net income (loss) to net cash used for operating activities:
Depreciation, depletion and amortization	12,597	10,209
Amortization of deferred financing fees	270	295
Deferred income taxes	(248)	(3,333)
Other	7,569	(12,444)
Working capital changes:
Accounts receivable	31,466	40,334
Inventories	(3,723)	2,070
Other current assets	(9,163)	(4,131)
Accounts payable	(33,695)	(37,738)
Other current liabilities	(21,337)	(7,389)
Net cash used for operating activities	(21,412)	(2,558)
Investing activities
Expenditures for property, plant and equipment	(41,180)	(13,816)
Other	380	1,101
Net cash used for investing activities	(40,800)	(12,715)
Financing activities
Additions to long-term debt	1,553	1,768
Reductions of long-term debt	(1,710)	(7,264)
Net additions (reductions) to revolving credit agreements	46,063	(8,280)
Cash dividends paid	(3,957)	(4,134)
Purchase of treasury shares	(14,247)	(21,608)
Other	2	(10)
Net cash provided by (used for) financing activities	27,704	(39,528)
Effect of exchange rate changes on cash	25	4
Cash and cash equivalents
Decrease for the period	(34,483)	(54,797)
Balance at the beginning of the period	95,390	139,855
Balance at the end of the period	$ 60,907	$ 85,058