Acquisitions (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012
Go-Coil [Member]
Business Acquisition [Line Items]
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 Revenue	762,978,000
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, Pro Forma Net Income (Loss)	8,412,000
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.15
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.14
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, Purchase Price Allocation [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