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
Mar. 31, 2018
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Awards expected to vest by period 246,528
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