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Business Acquisitions, Goodwill and Other Intangible Assets - Net Assets Acquired (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Nov. 30, 2015
Identifiable intangible assets:        
Goodwill $ 75,337 $ 75,337    
Oil and Gas        
Business Acquisition [Line Items]        
Business Combination, Net Working Capital Adjustment     $ 2,354 $ 2,957
Cash and cash equivalents       355
Accounts receivable       28,263
Prepaid expenses and other current assets       7,228
Property and equipment       3,552
Identifiable intangible assets:        
Total identifiable intangible assets       44,500
Goodwill       60,294
Other non-current assets       20,683
Accounts payable       (2,544)
Accrued compensation and benefits       (7,201)
Other accrued liabilities       (5,110)
Current portion of long-term debt       (6,485)
Long-term debt, net of current portion       (18,547)
Non-controlling interest       (490)
Net assets acquired       124,498
Oil and Gas | Customer relationships and backlog        
Identifiable intangible assets:        
Total identifiable intangible assets       43,500
Oil and Gas | Internally developed software        
Identifiable intangible assets:        
Total identifiable intangible assets       1,000
Previously Reported | Oil and Gas        
Business Acquisition [Line Items]        
Cash and cash equivalents       355
Accounts receivable       26,406
Prepaid expenses and other current assets       7,276
Property and equipment       3,552
Identifiable intangible assets:        
Total identifiable intangible assets       44,500
Goodwill       64,673
Other non-current assets       20,683
Accounts payable       (2,587)
Accrued compensation and benefits       (7,199)
Other accrued liabilities       (5,210)
Current portion of long-term debt       (6,447)
Long-term debt, net of current portion       (18,547)
Non-controlling interest       0
Net assets acquired       127,455
Previously Reported | Oil and Gas | Customer relationships and backlog        
Identifiable intangible assets:        
Total identifiable intangible assets       43,500
Previously Reported | Oil and Gas | Internally developed software        
Identifiable intangible assets:        
Total identifiable intangible assets       1,000
Adjustment | Oil and Gas        
Business Acquisition [Line Items]        
Cash and cash equivalents       0
Accounts receivable       (1,857)
Prepaid expenses and other current assets       48
Property and equipment       0
Identifiable intangible assets:        
Total identifiable intangible assets       0
Goodwill       4,379
Other non-current assets       0
Accounts payable       (43)
Accrued compensation and benefits       2
Other accrued liabilities       (100)
Current portion of long-term debt       38
Long-term debt, net of current portion       0
Non-controlling interest       490
Net assets acquired       (2,957)
Adjustment | Oil and Gas | Customer relationships and backlog        
Identifiable intangible assets:        
Total identifiable intangible assets       0
Adjustment | Oil and Gas | Internally developed software        
Identifiable intangible assets:        
Total identifiable intangible assets       $ 0