Acquisitions Acquisitions (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Go-Coil [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 110,400,000
Business Acquisition, Purchase Price Allocation [Abstract]
Cash acquired	313,000
Other current assets	9,068,000
Property and equipment	30,103,000
Intangibles and other assets	33,695,000
Goodwill	41,683,000
Total assets acquired	114,862,000
Current liabilities	4,337,000
Long-term debt	131,000
Total liabilities assumed	4,468,000
Net assets acquired	110,394,000
Business Acquisition, Nonrecurring Costs For Discontinued Compensation Arrangements and Acquisition Related Costs That Have Been Excluded From Pro Forma Net Income (Loss)	14,100,000
Business Acquisition, Pro Forma Information [Abstract]
Total revenues	762,978,000
Net earnings	8,412,000
Basic	$ 0.15
Diluted	$ 0.14
Business Combination, Working Capital, Estimated Payable Amount	1,000,000
Go-Coil [Member] | Onshore [Member]
Business Acquisition [Line Items]
Coiled Tubing Units	7
Go-Coil [Member] | Offshore [Member]
Business Acquisition [Line Items]
Coiled Tubing Units	3
Other production services businesses [Member]
Business Acquisition, Pro Forma Information [Abstract]
Number of Businesses Acquired	4
Business Acquisition, Cost of Acquired Entity, Cash Paid	6,500,000
Business Acquisition, Purchase Price Allocation, Tangible Assets	5,200,000
Wireline Units	6
Well Service Rigs	2
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	$ 1,300,000