Segment Reporting Revenue by Product Sales and Services (Details) (USD $)	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
Revenue from External Customer [Line Items]
Sales Revenue, Services, Net									$ 693,895,000	$ 621,752,000	$ 568,220,000
Sales Revenue, Goods, Net									287,185,000	285,896,000	226,433,000
Revenue, Net	254,455,000	245,428,000	247,006,000	234,191,000	243,786,000	231,344,000	225,785,000	206,733,000	981,080,000	907,648,000	794,653,000
Operating Segment Reservoir Description [Member]
Revenue from External Customer [Line Items]
Sales Revenue, Services, Net									472,426,000	443,050,000	403,443,000
Sales Revenue, Goods, Net									23,103,000	26,725,000	22,386,000
Revenue, Net									495,529,000	469,775,000	425,829,000
Operating Segment Production Enhancement [Member]
Revenue from External Customer [Line Items]
Sales Revenue, Services, Net									161,679,000	129,400,000	122,046,000
Sales Revenue, Goods, Net									242,113,000	242,049,000	191,910,000
Revenue, Net									403,792,000	371,449,000	313,956,000
Operating Segment Reservoir Management [Member]
Revenue from External Customer [Line Items]
Sales Revenue, Services, Net									59,790,000	49,302,000	42,731,000
Sales Revenue, Goods, Net									21,969,000	17,122,000	12,137,000
Revenue, Net									$ 81,759,000	$ 66,424,000	$ 54,868,000