Share-Based Compensation and Benefit Plans (Other Share-Based Compensation) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017 Rate
Restricted stock [Member] | Director [Member]
Share-Based Compensation and Benefit Plans
Other employee benefit plan, description	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
Vesting period	3 years
Employee stock purchase plan [Member]
Share-Based Compensation and Benefit Plans
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%