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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of penny warrants issuable (in shares) | shares   250,000  
Impairment of right-of-use and long-lived assets $ 4,671 $ 0  
Impairment of right-of-use assets 2,800    
Impairment of leasehold improvements 1,900    
Operating right-of-use assets 32,515   $ 36,689
Nonrecurring      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating right-of-use assets 2,033   0
Leasehold improvements 468   0
Nonrecurring | Level 3      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating right-of-use assets 2,033   0
Leasehold improvements $ 468   $ 0
Valuation, income approach | Discount rate      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
ROU assets And leasehold improvements, measurement input 0.120