Share-Based Compensation and Benefit Plans (Other Share-Based Compensation) (Narrative) (Details) - 6 months ended Jun. 30, 2015	Total
Employee Stock Purchase Plan [Member]
Other employee benefit plan description	an employee stock purchase plan (the "ESPP"), which permits all eligible employees to purchase shares of the Company’s common stock at 85% of the fair market value
Employee stock purchase plan stock purchase percentage	85.00%
Restricted Stock [Member]
Other employee benefit plan description	a performance incentive plan, which provides for the award of shares of restricted stock to its corporate and senior management that vest evenly over a three-year period and are held in escrow until such vesting has occurred; and a director stock plan, which provides for the award of shares of restricted stock to the Company's independent directors that vest evenly over a three-year period and are held in escrow until such vesting has occurred. The fair value of shares awarded under these plans is based on the closing market price of the Company's common stock on the date of award, and compensation expense is recorded evenly over the minimum required service period
Vesting period	3 years