Business Segment, Geographic and Major Customer Information (Reportable Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 77,014	$ 87,942	$ 87,030	$ 82,373	$ 124,503	$ 116,761	$ 105,318	$ 102,575	$ 334,359	$ 449,157	$ 371,065
Gross margin	28,104	$ 31,227	$ 29,252	$ 26,527	50,890	$ 46,078	$ 42,310	$ 43,681	115,110	182,959	147,527
Income (loss) from operations									(19,173)	80,888	58,726
Depreciation and amortization									18,024	17,848	15,109
Total assets	403,090				423,276				403,090	423,276	375,581
Capital expenditures									20,468	19,907	15,007
Operating Segments [Member] | Energy Chemistry Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									213,593	268,761	200,932
Gross margin									81,936	117,867	88,536
Income (loss) from operations									43,902	84,846	65,396
Depreciation and amortization									4,791	4,401	3,160
Total assets	153,447				156,596				153,447	156,596	127,119
Capital expenditures									12,803	6,983	5,225
Operating Segments [Member] | Consumer and Industrial Chemistry Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									56,374	51,091	42,927
Gross margin									14,371	12,897	10,659
Income (loss) from operations									8,742	6,558	6,260
Depreciation and amortization									2,202	2,138	1,126
Total assets	93,038				87,412				93,038	87,412	86,640
Capital expenditures									568	115	183
Operating Segments [Member] | Drilling Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									52,112	113,302	112,406
Gross margin									16,702	45,651	43,156
Income (loss) from operations									(27,340)	19,022	18,306
Depreciation and amortization									8,539	9,808	9,632
Total assets	108,354				147,584				108,354	147,584	135,738
Capital expenditures									2,865	9,626	6,326
Operating Segments [Member] | Production Technologies [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									12,280	16,003	14,800
Gross margin									2,101	6,544	5,176
Income (loss) from operations									(4,111)	3,246	3,060
Depreciation and amortization									750	327	250
Total assets	27,979				21,843				27,979	21,843	16,647
Capital expenditures									1,212	942	1,749
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									(40,366)	(32,784)	(34,296)
Depreciation and amortization									1,742	1,174	941
Total assets	$ 20,272				$ 9,841				20,272	9,841	9,437
Capital expenditures									$ 3,020	$ 2,241	$ 1,524