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           Severance Agreement with Former Chief Executive Officer (Tables) 
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        3 Months Ended | |||||||||||||||
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           Mar. 31, 2015 
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| Severance Agreement with Former Chief Executive Officer | ||||||||||||||||
| Schedule of changes in the severance liability of former CEO | 
 The change in the severance liability to our former CEO for the three months ended March 31, 2015 was as follows (in thousands): 
 
 
 
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