Employee Benefit Plan Employee Benefit Plan - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Rate	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plan [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent	100.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	5.00%
Defined Contribution Plan, Cost Recognized	$ 267,000	$ 180,000	$ 111,000