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Balance Sheet Account Detail (Amortization) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Balance Sheet Related Disclosures [Abstract]        
Amortization expense $ 400 $ 100 $ 800 $ 200
Remainder of 2015 517   517  
2016 949   949  
2017 2,213   2,213  
2018 3,693   3,693  
2019 4,750   4,750  
2020 5,416   5,416  
2021 & Thereafter 22,456   22,456  
Total $ 39,994   $ 39,994