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Restructuring Charges (Summary of Restructuring Costs) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Reserve [Roll Forward]      
Balance at the beginning of the period $ 0    
Accruals 12,026,000 $ 0 $ 0
Payments 514,000    
Balance at the end of the period 11,512,000 0  
Cumulative Charges Incurred 12,026,000    
Termination benefits      
Restructuring Reserve [Roll Forward]      
Balance at the beginning of the period 0    
Accruals 8,880,000    
Payments 491,000    
Balance at the end of the period 8,389,000 0  
Cumulative Charges Incurred 8,880,000    
Contract termination costs      
Restructuring Reserve [Roll Forward]      
Balance at the beginning of the period 0    
Accruals 338,000    
Payments 0    
Balance at the end of the period 338,000 0  
Cumulative Charges Incurred 338,000    
Other related costs      
Restructuring Reserve [Roll Forward]      
Balance at the beginning of the period 0    
Accruals 2,808,000    
Payments 23,000    
Balance at the end of the period 2,785,000 $ 0  
Cumulative Charges Incurred $ 2,808,000