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Share-Based Compensation - Awards Authorized (Details) - Performance Shares - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total Number of Shares Awarded 531,700 383,814 211,593
Potential Number of Performance-Based Shares to be Vested 903,364 687,015 389,242
Potential Number of Performance-Based Shares to be Vested period 2019 2018 2017