Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Lease Costs (Details)

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Commitments and Contingencies - Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]      
Amortization of right-of-use assets $ 217    
Interest on lease obligations 10    
Finance lease costs 227 $ 300 $ 200
Operating lease cost 4,556    
Sublease income (957) $ (1,100) $ (1,400)
Total lease cost $ 3,826