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Senior Notes Senior Notes Interest Expense and Discount (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]        
Accretion of debt discount, net of debt premium on senior notes     $ 151 $ 242
Convertible Notes amortization of debt issuance costs     393 189
Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior Notes interest expense $ 6,625 $ 5,383 13,250 10,766
Convertible Notes amortization of debt issuance costs 69 34 136 68
Senior Notes [Member] | Senior Note One [Member]        
Debt Instrument [Line Items]        
Accretion of debt discount, net of debt premium on senior notes 131 $ 122 260 $ 242
Senior Notes [Member] | Senior Note Two [Member]        
Debt Instrument [Line Items]        
Accretion of debt discount, net of debt premium on senior notes $ 55   $ 109