Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Business Segment, Geographic and Major Customer Information (Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 124,503us-gaap_Revenues	$ 116,761us-gaap_Revenues	$ 105,318us-gaap_Revenues	$ 102,575us-gaap_Revenues	$ 100,848us-gaap_Revenues	$ 98,388us-gaap_Revenues	$ 93,586us-gaap_Revenues	$ 78,243us-gaap_Revenues	$ 449,157us-gaap_Revenues	$ 371,065us-gaap_Revenues	$ 312,828us-gaap_Revenues
Gross margin	50,890us-gaap_GrossProfit	46,078us-gaap_GrossProfit	42,310us-gaap_GrossProfit	43,681us-gaap_GrossProfit	39,801us-gaap_GrossProfit	37,502us-gaap_GrossProfit	37,594us-gaap_GrossProfit	32,630us-gaap_GrossProfit	182,959us-gaap_GrossProfit	147,527us-gaap_GrossProfit	131,619us-gaap_GrossProfit
Income (loss) from operations									80,888us-gaap_OperatingIncomeLoss	58,726us-gaap_OperatingIncomeLoss	58,621us-gaap_OperatingIncomeLoss
Depreciation and amortization									17,848us-gaap_DepreciationAndAmortization	15,109us-gaap_DepreciationAndAmortization	11,583us-gaap_DepreciationAndAmortization
Total assets	423,276us-gaap_Assets				375,581us-gaap_Assets				423,276us-gaap_Assets	375,581us-gaap_Assets	219,867us-gaap_Assets
Capital expenditures									19,907	15,007	20,701
Energy Chemical Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									268,761	200,932	183,986
Gross margin									117,867	88,536	81,438
Income (loss) from operations									84,846	65,396	65,440
Depreciation and amortization									4,401	3,160	1,765
Total assets	156,596				127,119				156,596	127,119	59,195
Capital expenditures									6,983	5,225	3,553
Consumer and Industrial Chemical Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									51,091	42,927	0
Gross margin									12,897	10,659	0
Income (loss) from operations									6,558	6,260	0
Depreciation and amortization									2,138	1,126	0
Total assets	87,412				86,640				87,412	86,640	0
Capital expenditures									115	183	0
Drilling Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									113,302	112,406	116,736
Gross margin									45,651	43,156	45,709
Income (loss) from operations									19,022	18,306	22,282
Depreciation and amortization									9,808	9,632	9,115
Total assets	147,584				135,738				147,584	135,738	118,771
Capital expenditures									9,626	6,326	12,264
Production Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									16,003	14,800	12,106
Gross margin									6,544	5,176	4,472
Income (loss) from operations									3,246	3,060	3,395
Depreciation and amortization									327	250	206
Total assets	21,843				16,647				21,843	16,647	11,189
Capital expenditures									942	1,749	77
Corporate and Other [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									0	0	0
Gross margin									0	0	0
Income (loss) from operations									(32,784)	(34,296)	(32,496)
Depreciation and amortization									1,174	941	497
Total assets	9,841				9,437				9,841	9,437	30,712
Capital expenditures									$ 2,241	$ 1,524	$ 4,807