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Share Based Compensation, 401(k) Plan and Deferred Compensation - Restricted Share Activity (Details) - Restricted Share Rights Awards [Member]
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Non-vested at January 1, 2018, shares | shares 455,643
Granted, shares | shares 220,241
Vested, shares | shares (197,344)
Forfeited, shares | shares (12,101)
Non-vested at December 31, 2018, shares | shares 466,439
Non-vested at January 1, 2018, Weighted Average Grant Date Fair Value | $ / shares $ 14.95
Granted, Weighted Average Grant Date Fair Value | $ / shares 15.71
Vested, Weighted Average Grant Date Fair Value | $ / shares 15.87
Forfeited, Weighted Average Grant Date Fair Value | $ / shares 15.04
Non-vested at December 31, 2018, Weighted Average Grant Date Fair Value | $ / shares $ 14.93
Non-vested at January 1, 2018, Aggregate Intrinsic Value | $ $ 8,288,146
Granted, Aggregate Intrinsic Value | $ 0
Vested, Aggregate Intrinsic Value | $ 5,923
Forfeited, Aggregate Intrinsic Value | $ 23,292
Non-vested at December 31, 2018, Aggregate Intrinsic Value | $ $ 70,677