Segment Information (Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summarized financial information regarding reportable segments
Net revenue from external customers	$ 76,702	$ 78,628	$ 78,303	$ 79,195	$ 74,904	$ 75,058	$ 55,918	$ 52,905	$ 312,828	$ 258,785	$ 146,982
Gross margin	31,300	33,843	33,025	33,451	31,714	30,717	22,244	21,145	131,619	105,820	52,970
Income (loss) from operations									58,621	48,888	(6,267)
Depreciation and amortization									11,583	10,105	13,768
Total assets	219,867				232,012				219,867	232,012	184,807
Capital expenditures									20,701	9,984	6,060
Chemicals and Logistics [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									183,986	140,836	66,121
Gross margin									81,438	56,115	29,249
Income (loss) from operations									65,440	43,549	19,833
Depreciation and amortization									1,765	1,594	1,671
Total assets	59,195				54,958				59,195	54,958	44,102
Capital expenditures									3,553	2,231	1,227
Drilling [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									116,736	102,470	65,782
Gross margin									45,709	43,607	18,991
Income (loss) from operations									22,282	23,035	(9,738)
Depreciation and amortization									9,115	8,061	11,445
Total assets	118,771				113,130				118,771	113,130	102,949
Capital expenditures									12,264	6,025	4,679
Artificial Lift [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									12,106	15,479	15,079
Gross margin									4,472	6,098	4,730
Income (loss) from operations									3,395	4,296	3,070
Depreciation and amortization									206	196	219
Total assets	11,189				10,815				11,189	10,815	9,062
Capital expenditures									77	182	32
Corporate [Member]
Summarized financial information regarding reportable segments
Net revenue from external customers									0	0	0
Gross margin									0	0	0
Income (loss) from operations									(32,496)	(21,992)	(19,432)
Depreciation and amortization									497	254	433
Total assets	30,712				53,109				30,712	53,109	28,694
Capital expenditures									$ 4,807	$ 1,546	$ 122