Summary Of Significant Accounting Policies (Changes In Carrying Amount Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Goodwill [Line Items]
Balance as of December 31, 2011	$ 82,571
Goodwill adjustments	8
Balance as of March 31, 2012	82,579
Completion And Remedial Services [Member]
Goodwill [Line Items]
Balance as of December 31, 2011	72,369
Goodwill adjustments	(29)
Balance as of March 31, 2012	72,340
Fluid Services [Member]
Goodwill [Line Items]
Balance as of December 31, 2011	4,086
Goodwill adjustments	97
Balance as of March 31, 2012	4,183
Well Servicing [Member]
Goodwill [Line Items]
Balance as of December 31, 2011	6,116
Goodwill adjustments	(60)
Balance as of March 31, 2012	6,056
Contract Drilling Services [Member]
Goodwill [Line Items]
Goodwill adjustments