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Balance Sheet Account Detail (Amortization) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]          
Amortization expense $ 900 $ 1,000 $ 1,700 $ 2,000  
Remainder of 2019 1,723   1,723    
2020 3,684   3,684    
2021 4,283   4,283    
2022 5,628   5,628    
2023 7,781   7,781    
2024 9,473   9,473    
Thereafter 27,961   27,961    
Total $ 60,533   $ 60,533   $ 62,255