Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Cash-Based Incentive Compensation - Outstanding Restricted Shares Issued to Non-employee Directors (Details)

v3.8.0.1
Share-Based Compensation and Cash-Based Incentive Compensation - Outstanding Restricted Shares Issued to Non-employee Directors (Details) - Restricted Shares - shares
Sep. 30, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Awards expected to vest by period 246,528 161,296
2018    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Awards expected to vest by period 106,240  
2019    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Awards expected to vest by period 91,164  
2020    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Awards expected to vest by period 49,124