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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)
 6 Months Ended
Jun. 30, 2016
shares
2007 Stock Incentive Plan (Shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 8,937,519 [1]
Shares Forfeited (55,653)
Shares Distributed (2,395,177)
Ending Balance 6,486,689
2007 ROI Unit Stock Plan (Shares) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 6,370
Shares Distributed (997)
Ending Balance 5,373
[1] Stock Incentive Plan number of granted shares related to 2015 was adjusted by 11,988 additional shares during the six months ended June 30, 2016.