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Commitments and Contingencies (Details) - Jun. 30, 2015 - Employment agreements
$ in Millions
USD ($)
Commitment and contingencies  
Period of salary and bonus payments following termination 12 months
Loss contingency, range of possible loss, maximum $ 11.4
Executive officer  
Commitment and contingencies  
Ratio applied to base salary to calculate severance payment 1.5
Period of continuing health benefits following termination 12 months
President and Chief Executive Officer  
Commitment and contingencies  
Ratio applied to base salary to calculate severance payment 2
Period of continuing health benefits following termination 18 months