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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 12, 2021
Dec. 31, 2020
Sep. 09, 2020
Mar. 19, 2014
Debt Instrument [Line Items]            
Common Stock, Par or Stated Value Per Share $ 0.01     $ 0.01    
Credit Facility amortization of debt issuance costs $ 193,000 $ 200,000        
Interest Expense 7,584,000 8,428,000        
Conversions and maturity of the convertible subordinated notes due 2021 3,980,000 0        
Payments for Repurchase of Redeemable Convertible Preferred Stock, Cash Payment 3,800,000          
Convertible Preferred Stock, Nonredeemable or Redeemable, Issuer Option, Value         $ 2,400,000  
Additional Paid-in Capital            
Debt Instrument [Line Items]            
Adjustments to Additional Paid in Capital, Other 1,400,000          
Convertible Subordinated Notes [Member]            
Debt Instrument [Line Items]            
Convertible subordinated notes, principal amount       $ 2,559,000    
Stated interest rate percentage           2.75%
Acquisition debt imputed interest expense 18,000 43,000        
Credit Facility amortization of debt issuance costs 1,000 $ 6,000        
Debt Instrument, Discount Rate   11.40%        
Accretion of discount, convertible subordinated notes 20,000 $ 65,000        
Carrying value of the liability component $ 0   $ 200,000 $ 2,538,000 $ 0  
Debt Instrument, Unamortized Debt Issuance Costs 3.10% 3.20%