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Acquisitions and Divestitures - Subsidiary Divestiture Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 12, 2015
Jun. 30, 2015
Jun. 30, 2014
Noncash or Part Noncash Divestitures [Line Items]      
Gain on sale of subsidiary   $ 8,265  
FMIG      
Noncash or Part Noncash Divestitures [Line Items]      
Purchase price $ 18,000    
Amount paid at closing 16,000    
Promissory note $ 2,000    
Term of promissory note (in years) 2 years    
Gain on sale of subsidiary $ 8,300