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Long-Term Debt (Narrative) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
May. 13, 2014
May. 12, 2014
Debt Instrument [Line Items]        
Amount outstanding under revolving credit facility $ 144,083,000 $ 190,575,000    
2016 60,000      
2017 0      
2018 0      
2019 144,000,000      
Thereafter 0      
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement        
Debt Instrument [Line Items]        
Aggregate commitments 250,000,000      
Maximum amount of aggregate commitments (up to $50,000,000) 50,000,000      
Amount outstanding under revolving credit facility 144,000,000 $ 190,000,000    
Available borrowings 103,697,000      
Bank revolving credit facility | Amended and Restated Revolving Credit Agreement | Standby Letters of Credit        
Debt Instrument [Line Items]        
Amount of capacity $ 2,303,000      
Specialized Industries LP | Amended and Restated Revolving Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit     $ 250,000,000 $ 100,000,000