Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income (loss)	$ (38,118)	$ 44,450	$ 108,698
Income from discontinued operations	0	0	66,535
Income (loss) from continuing operations	(38,118)	44,450	42,163
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	28,070	24,572	17,992
Amortization of deferred financing fees	229	614	1,118
Deferred income taxes	(41,347)	(7,646)	14,646
Reed Minerals long-lived asset impairment charge	105,119	0	0
Reed Minerals goodwill impairment charge	0	3,973	0
Gain on sale of assets	(7,339)	(588)	(6,811)
Other	14,667	(14,572)	13,117
Working capital changes, excluding the effect of business acquisitions:
Accounts receivable	(22,506)	(2,779)	(19,154)
Inventories	(879)	(14,871)	(2,776)
Other current assets	201	(802)	(1,077)
Accounts payable	(2,963)	4,851	23,870
Other current liabilities	(15,335)	15,863	(8,753)
Net cash provided by operating activities of continuing operations	19,799	53,065	74,335
Net cash provided by operating activities of discontinued operations	0	0	68,679
Investing Activities
Expenditures for property, plant and equipment	(57,500)	(57,449)	(44,682)
Acquisition of business	(25,000)	0	(69,287)
Proceeds from the sale of assets	8,134	2,504	35,974
Proceeds from note receivable	0	0	14,434
Cash payment for cost method investment	0	(5,000)	0
Other	(568)	(789)	(207)
Net cash used for investing activities of continuing operations	(74,934)	(60,734)	(63,768)
Net cash used for investing activities of discontinued operations	0	0	(10,469)
Financing Activities
Reductions of long-term debt	(9,399)	(15,803)	(62,446)
Net additions to revolving credit agreements	73,546	19,654	82,655
Cash dividends paid	(7,755)	(8,104)	(45,130)
Cash dividends received from Hyster-Yale	0	0	5,000
Purchase of treasury shares	(35,075)	(31,306)	(3,178)
Financing fees paid	(333)	(1,209)	(1,433)
Other	(5)	(8)	12
Net cash provided by (used for) financing activities of continuing operations	20,979	(36,776)	(24,520)
Net cash used for financing activities of discontinued operations	0	0	(98,913)
Effect of exchange rate changes on cash of continuing operations	(99)	(20)	24
Effect of exchange rate changes on cash of discontinued operations	0	0	838
Decrease for the year	(34,255)	(44,465)	(53,794)
Net increase related to discontinued operations	0	0	39,865
Balance at the beginning of the year	95,390	139,855	153,784
Balance at the end of the year	$ 61,135	$ 95,390	$ 139,855