Segment Geographic and Market Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Geographic and Market Information [Abstract]

Segment disclosure

	2011		2010		2009
Net sales:
Minerals and materials	$	481,898	$	429,270	$	336,172
Environmental		246,385		220,598		203,231
Oilfield services		193,632		154,621		119,821
Transportation		54,113		52,225		46,642
Intersegment sales		(33,659)		(15,677)		(14,002)
Total		942,369		841,037		691,864
Operating profit (loss):
Minerals and materials	$	69,082	$	54,580	$	34,789
Environmental		18,441		19,814		25,090
Oilfield services		19,881		14,618		12,753
Transportation		2,241		2,4302		2,163
Corporate		(21,992)		(21,401)		(21,918)
Total		87,653		70,041		52,877
Assets:
Minerals and materials	$	422,093	$	402,640	$	384,896
Environmental		161,373		160,053		151,265
Oilfield services		194,408		173,239		145,981
Transportation		3,912		4,071		3,552
Corporate		60,916		59,090		48,566
Total		842,702		799,093		734,260
Depreciation, depletion and amortization:
Minerals and materials	$	20,082	$	17,165	$	16,122
Environmental		5,389		5,352		6,219
Oilfield services		13,363		11,888		11,767
Transportation		76		46		38
Corporate		2,926		1,855		1,760
Total		41,836		36,306		35,906
Capital expenditures:
Minerals and materials	$	27,306	$	29,700	$	35,659
Environmental		8,343		2,557		2,325
Oilfield services		23,097		13,249		11,095
Transportation		198		92		39
Corporate		2,085		1,707		11,300
Total		61,029		47,305		60,418
Research and development expenses:
Minerals and materials	$	6,488	$	5,913	$	5,344
Environmental		2,311		2,284		2,339
Oilfield services		238		697		659
Corporate		42		337		315
Total		9,079		9,231		8,657

Geographic information

		0000000000		0000000000		0000000000
	2011		2010		2009
Sales to unaffiliated customers shipped from:
Americas	$	589,277	$	531,133	$	441,483
EMEA		220,067		185,506		168,202
Asia Pacific		133,025		124,398		82,179
Total		942,369		841,037		691,864
Operating profit from sales from:
Americas	$	57,088	$	45,818	$	27,236
EMEA		12,543		6,455		14,124
Asia Pacific		18,022		17,768		11,517
Total		87,653		70,041		52,877
Accounts receivable in:
Americas	$	111,704	$	108,324	$	76,723
EMEA		54,245		47,318		41,401
Asia Pacific		40,885		38,326		30,136
Total		206,834		193,968		148,260
Property, plant, equipment, and mineral rights and reserves in:
Americas	$	115,720	$	110,198	$	108,352
EMEA		98,067		100,680		80,693
Asia Pacific		48,790		49,610		47,201
Total		262,577		260,488		236,246
Identifiable assets in:
Americas	$	420,973	$	433,130	$	453,894
EMEA		282,163		252,065		197,897
Asia Pacific		139,566		113,898		82,469
Total		842,702		799,093		734,260

Net sales by product line

		0000000000		0000000000		0000000000
	2011		2010		2009
Metalcasting	$	251,467	$	204,577	$	139,849
Oilfield services		193,632		154,621		119,821
Specialty materials		105,788		107,287		98,097
Lining technologies		104,220		110,614		103,046
Building materials		80,686		58,860		55,823
Pet products		55,924		61,971		66,441
Basic minerals		55,088		49,199		27,901
Contracting services		35,992		31,075		25,519
Drilling products		31,385		26,285		22,727
Transportation		54,113		52,225		46,642
Intersegment shipping revenue		(25,926)		(15,677)		(14,002)
Total		942,369		841,037		691,864

Revenue generating activities and related cost of goods sold

	2011		2010		2009
Net sales by source
Net sales of tangible goods	$	709,020	$	636,562	$	522,530
Services revenues		205,162		167,927		136,694
Freight revenues		28,187		36,548		32,640
Total		942,369		841,037		691,864
Cost of sales:
Cost of tangible goods sold		511,026		467,431		382,500
Cost of services rendered		156,422		125,997		95,982
Cost associated with freight revenue		22,046		30,683		27,112
Total		689,494		624,111		505,594