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Acquisitions (Details) (USD $)
0 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Nov. 02, 2012
Acquisition of NESA
Jun. 30, 2013
Acquisition of NESA
Nov. 02, 2012
Acquisition of NESA
Vendor contract intangible asset
Nov. 02, 2012
Acquisition of NESA
Covenants not to compete
Nov. 02, 2012
Acquisition of NESA
Other intangible asset
Nov. 02, 2012
Acquisition of NESA
Minimum
Nov. 02, 2012
Acquisition of NESA
Maximum
Mar. 31, 2013
Jacobs Trading, LLC
Dec. 31, 2012
Jacobs Trading, LLC
Dec. 31, 2013
Jacobs Trading, LLC
Dec. 31, 2012
Jacobs Trading, LLC
Sep. 30, 2012
Jacobs Trading, LLC
Jun. 30, 2013
Jacobs Trading, LLC
Oct. 02, 2011
Jacobs Trading, LLC
Oct. 02, 2011
Jacobs Trading, LLC
Restricted shares
Oct. 02, 2011
Jacobs Trading, LLC
Restricted shares
Level 3
Put Option Analysis
Nov. 30, 2012
Jacobs Trading, LLC
Seller subordinated unsecured note
Oct. 02, 2011
Jacobs Trading, LLC
Seller subordinated unsecured note
Acquisitions                                    
Upfront cash payment $ 18,300,000                         $ 80,000,000        
Fixed interest rate (as a percent)                                   5.00%
Note issued to seller                                   40,000,000
Stock consideration paid for acquisition (in shares)                             900,171      
Stock consideration                             24,500,000      
Discount rate (as a percent)                               15.00%    
Number of months for which stock is not freely tradable                             6 months      
Period after the closing date of acquisition during which EBITDA earned is used to calculate the earn-out           P36M P48M                      
Period of actual performance of the acquiree entity after the closing date of acquisition to calculate the earn-out                   12 months 12 months              
Percentage EBITDA growth capped 20.00%                                  
Possible total earn out payment, low end of range 0                                  
Possible total earn out payment, high end of range 37,700,000                         30,000,000        
Estimated fair value of earn-out, acquisition date 18,000,000                         8,300,000        
Additional liability accrued (liability reversed)                 5,100,000     6,200,000            
Earn-out payments made               2,200,000 17,400,000                  
Estimated fair value of earn-out, end of period   18,300,000                   14,500,000 0          
Debt paid in full                                 40,000,000  
Purchase consideration allocated to acquired tangible assets, identifiable intangible assets, liabilities assumed and goodwill                                    
Cash 3,760,000                                  
Goodwill 27,009,000                                  
Finite-lived intangible assets     3,936,000 1,400,000 225,000                          
Property and equipment 234,000                                  
Accrued liabilities (204,000)                                  
Total consideration $ 36,360,000                                  
Percentage of expected tax deductible of goodwill 75.00%