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Stockholders' Equity (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2014
Class of Stock [Line Items]      
Preferred Stock, Shares Authorized 20,000,000 20,000,000  
Preferred Stock, Par Value Per Share $ 1.00 $ 1.00  
Common Stock, Shares, Issued 9,038,751    
Common Stock, Shares Reserved for Future Issuance Under Management Incentive Plan 640,000   1,200,000
Preferred Stock, Shares Issued 104,574    
Preferred Stock, Liquidation Preference Per Share $ 1,000    
Preferred stock $ 4,600,000    
Preferred Stock, Dividend Rate, Percentage 7.50%    
Preferred stock dividend condition - minimum pension funding 90.00%    
Preferred stock dividend condition - minimum net income preceding quarter $ 7,500,000    
Preferred stock dividend condition - minimum free cash flow preceding four quarters 35,000,000    
Preferred stock dividend condition - minimum cash balance preceding quarter 150,000,000    
Preferred Stock, Liquidation Preference, Value 111,500,000    
Preferred Stock, Cumulative Undeclared Dividend 6,900,000    
Operating Loss Carryforwards $ 789,700,000    
Common Stock Ownership Enabling Preferred Stock Purchase Rights 4.99%    
Common Stock Ownership Enabling Preferred Stock Purchase Rights, Incremental 0.50%    
Common Class A [Member]      
Class of Stock [Line Items]      
Common Stock, Shares Authorized 70,000,000 70,000,000  
Common Stock, Par Value Per Share $ 0.10 $ 0.10  
Common Stock, Shares, Issued 7,632,669 7,563,600  
Stock Issued During Period, Shares, New Issues 38,751    
Conversion of Stock, Shares Converted 30,318    
Common Class B [Member]      
Class of Stock [Line Items]      
Common Stock, Shares Authorized 30,000,000 30,000,000  
Common Stock, Par Value Per Share $ 0.10 $ 0.10  
Common Stock, Shares, Issued 1,406,082 1,436,400  
Stock Issued During Period, Shares, New Issues 38,751    
Conversion of Stock, Shares Converted 30,318    
Preferred Series B [Member]      
Class of Stock [Line Items]      
Preferred stock $ 4,600,000 $ 0