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Acquisitions (Details Textual) (USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 11, 2013
Jun. 30, 2013
Dec. 31, 2012
Interlube [Member]
Jun. 30, 2013
Interlube [Member]
Person
Mar. 11, 2013
Interlube [Member]
Dec. 31, 2012
Smith Services [Member]
Jun. 30, 2013
Smith Services [Member]
Person
Apr. 11, 2013
Smith Services [Member]
Dec. 31, 2012
Standard Machine [Member]
Jun. 30, 2013
Standard Machine [Member]
Person
May 13, 2013
Standard Machine [Member]
Acquisitions (Textual) [Abstract]                      
Cost of acquisition         $ 14.8     $ 13.3     $ 39.7
Cash Acquired from Acquisition 0.3 0.1                  
Entity Number of Employees       90     140     125  
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period     $ 13     $ 17     $ 31