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Acquisitions and Divestitures - MGES Acquisition (Details) - USD ($)
1 Months Ended
May. 06, 2013
Aug. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Allocation of aggregate purchase price        
Goodwill     $ 91,967,000 $ 98,726,000
MGES        
Allocation of aggregate purchase price        
Current assets $ 4,475,000      
Property, plant and equipment 1,369,000      
Identifiable intangible assets 600,000      
Goodwill 16,555,000      
Total assets acquired 22,999,000      
Current liabilities assumed (1,984,000)      
Total purchase price $ 21,015,000      
MGES | Minimum        
Allocation of aggregate purchase price        
Identifiable intangible assets, estimated useful lives 1 year      
MGES | Maximum        
Allocation of aggregate purchase price        
Identifiable intangible assets, estimated useful lives 6 years      
MGES | Stock purchase agreement        
Acquisitions        
Total purchase consideration $ 20,000,000 $ 563,000    
Percentage of purchase consideration payable in cash 50.00%      
Percentage of purchase consideration paid in shares 50.00%      
Cash payment $ 9,000,000      
Number of common stock shares issued 761,545      
Amount retained for final purchase price adjustment $ 1,000,000