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Subsequent Event (Details) - Subsequent event
$ in Millions
May 10, 2017
USD ($)
shares
Subsequent Event [Line Items]  
Unvested restricted share awards forfeited (in shares) | shares 130,500
Unvested restricted share awards forfeited, value | $ $ 0.4
Performance shares  
Subsequent Event [Line Items]  
Shares forfeited (in shares) | shares 141,000
Shares forfeited, value | $ $ 1.0