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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans [Abstract]
Current Fiscal Year End Date	--12-31
Defined Contribution Plan, Cost Recognized	$ 11.3	$ 8.1	$ 5.7
Defined Benefit Plan, Benefits Paid			75
Agreed upon separation agreement % interest earned on unpaid benefits for former President and Senior VP and Secretary			8.75%
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	$ 0.4

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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