Stockholders' Equity and Compensation Arrangements Stock Option Activity (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Options [Abstract]
Outstanding stock options		1,584,832
Exercise of stock options, shares		(253,511)
Forfeited stock options		(61,650)
Outstanding stock options		1,269,671	1,584,832
Weighted average number of shares outstanding
Weighted Average Exercise Price Outstanding Stock Options		$ 0.95
Weighted Average Exercise Price, Exercised Options		1.26
Weighted Average Exercise Price, Forfeited Options		0.73
Weighted Average Exercise Price Outstanding Stock Options		$ 0.87	$ 0.95
Weighted Average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term		3 years 7 months 20 days	3 years 11 months 15 days
Weighted Average Remaining Contractual Term		3 years 7 months 20 days	3 years 11 months 15 days
Aggregate Intrinsic Value [Abstract]
Average Intrinsic Value, Outstanding	[1]	$ 3,360
Average Intrinsic Value, Outstanding	[1]	$ 4,071	$ 3,360

[1] The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of March 31, 2016 and December 31, 2015, respectively.