Share-Based Compensation and Benefit Plans (Profit Sharing and Savings Plan) (Narrative) (Details) (Profit Sharing And Savings Plan [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Profit Sharing And Savings Plan [Member]
Share-Based Compensation and Benefit Plans
Other employee benefit plan description	The Company sponsors a contributory profit sharing and savings plan (the "401(k) Plan") that covers substantially all employees who are at least 21 years of age and have at least six months of service. The Company makes matching contributions equal to 100% of the first 2% of each employee's wages that are contributed and 25% of the next 4% of each employee's wages that are contributed.
Profit sharing and savings plan employer discretionary contribution	$ 0	$ 0
Profit sharing and savings plan cost recognized	$ 4.2	$ 3.9