Annual report pursuant to Section 13 and 15(d)

Variable Interest Entities (Narrative) (Details)

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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]      
Restricted cash included in other current assets $ 6,630 $ 775 $ 938
Agreed indemnification for loss or recapture of NMTC 12,500    
Primary Beneficiary      
Variable Interest Entity [Line Items]      
Restricted cash included in other current assets 6,600 800  
Assets 32,000 89,000  
Liabilities $ 21,800 $ 63,000