Employee Benefit Plan (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Employer Contribution on employee benefit plan	$ 0.6	$ 0.3	$ 0.3
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage contribution from employees	6.00%
First 4% of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	25.00%	25.00%
Percentage contribution from employees	4.00%	4.00%
Second 2% of Employee Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution rate as a percentage of employee contribution	50.00%
Percentage contribution from employees	2.00%