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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Sep. 27, 2018
Accounting Policies [Abstract]          
Stock dividend paid to company stockholders         5.00%
Embedded Derivative [Line Items]          
Fair market value of embedded derivatives at the midpoint of the inputs $ 17,287     $ 31,424  
Impact of adoption of new accounting standards (1,550) $ (12,857)      
AOCI Attributable to Parent          
Embedded Derivative [Line Items]          
Impact of adoption of new accounting standards (4,697) $ (6,036)      
ASU 2018-02          
Embedded Derivative [Line Items]          
Decrease in accumulated deficit     $ 4,697    
Minimum          
Embedded Derivative [Line Items]          
Fair market value of embedded derivatives at the midpoint of the inputs 17,221     31,371  
Maximum          
Embedded Derivative [Line Items]          
Fair market value of embedded derivatives at the midpoint of the inputs $ 17,355     $ 31,519