Recent Accounting Pronouncements (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended							12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Buildings and leasehold improvements [Member] Minimum [Member]	Dec. 31, 2012 Buildings and leasehold improvements [Member] Maximum [Member]	Dec. 31, 2012 Machinery, equipment and rental tools [Member] Minimum [Member]	Dec. 31, 2012 Machinery, equipment and rental tools [Member] Maximum [Member]	Dec. 31, 2012 Furniture and fixtures [Member]	Dec. 31, 2012 Transportation equipment [Member]	Dec. 31, 2011 Transportation equipment [Member]	Dec. 31, 2012 Transportation equipment [Member] Minimum [Member]	Dec. 31, 2012 Transportation equipment [Member] Maximum [Member]	Dec. 31, 2012 Computer Equipment and Software [Member] Minimum [Member]	Dec. 31, 2012 Computer Equipment and Software [Member] Maximum [Member]	Dec. 31, 2012 Computer software [Member]	Dec. 31, 2012 Computer software [Member] Minimum [Member]	Dec. 31, 2012 Computer software [Member] Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life			2 years	30 years	7 years	10 years	3 years			2 years	5 years	3 years	7 years		3 years	7 years
Property and equipment, unamortized	$ 96,860	$ 76,074						$ 5,136	$ 4,853					$ 4,600