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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)
 9 Months Ended
Sep. 30, 2016
shares
2007 Stock Incentive Plan (Shares)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 8,937,985 [1]
Shares Forfeited (66,137)
Shares Distributed (2,400,019)
Ending Balance 6,471,829
2007 ROI Unit Stock Plan (Shares) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 6,370
Shares Distributed (1,376)
Ending Balance 4,994
[1] Stock Incentive Plan number of granted shares related to 2015 was adjusted by 12,454 additional shares during the nine months ended September 30, 2016.