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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)
 6 Months Ended
Jun. 30, 2018
shares
2007 Stock Incentive Plan (Shares)  
Beginning Balance 6,473,720 [1]
Shares Cancelled (42,289)
Shares Distributed (2,065,342)
Ending Balance 4,366,089
2007 ROI Unit Stock Plan (Shares) [Member]  
Beginning Balance 3,849
Shares Distributed (3,849)
[1] Stock Incentive Plan number of granted restricted stock units related to 2017 was adjusted by 23,082 additional restricted stock units during the six months ended June 30, 2018.