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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)
 3 Months Ended
Mar. 31, 2018
shares
2007 Stock Incentive Plan (Shares)  
Beginning Balance 6,468,973 [1],[2]
Shares Cancelled (11,637)
Shares Distributed (1,532)
Ending Balance 6,455,804
2007 ROI Unit Stock Plan (Shares) [Member]  
Beginning Balance 3,849
Shares Distributed (3,849)
[1] Includes 941,742 restricted stock units granted under the Company's amended 2007 Stock Incentive Plan, which was approved by the Company's stockholders at its 2018 Annual Meeting, held on April 19, 2018.
[2] Stock Incentive Plan number of granted restricted stock units related to 2017 was adjusted by 18,335 additional restricted stock units during the three months ended March 31, 2018.