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Balance Sheet Account Detail (Amortization) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]      
Amortization expense $ 1,300 $ 600 $ 300
2016 609    
2017 1,724    
2018 3,219    
2019 4,414    
2020 5,724    
2021 and thereafter 23,720    
Total $ 39,410