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Share Based Compensation - Restricted Share Activity (Details) - Restricted Share Rights Awards [Member]
3 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Non-vested at January 1, 2019, shares | shares 466,439
Granted, shares | shares 196,667
Vested, shares | shares (33,020)
Forfeited, shares | shares (3,437)
Non-vested at March 31, 2019, shares | shares 626,649
Non-vested at January 1, 2019, Weighted Average Grant Date Fair Value | $ / shares $ 14.93
Granted, Weighted Average Grant Date Fair Value | $ / shares 15.61
Vested, Weighted Average Grant Date Fair Value | $ / shares 15.15
Forfeited, Weighted Average Grant Date Fair Value | $ / shares 15.34
Non-vested at March 31, 2019, Weighted Average Grant Date Fair Value | $ / shares $ 15.13
Non-vested at January 1, 2019, Aggregate Intrinsic Value | $ $ 70,677
Granted, Aggregate Intrinsic Value | $ 3,070
Vested, Aggregate Intrinsic Value | $ 298
Forfeited, Aggregate Intrinsic Value | $ 0
Non-vested at March 31, 2019, Aggregate Intrinsic Value | $ $ 9,939