Stockholders' Equity and Compensation Arrangements Stock Option Activity (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Options [Abstract]
Outstanding stock options		2,262,994
Exercise of stock options, shares		(604,432)
Forfeited stock options		(1,926)
Outstanding stock options		1,656,636	2,262,994
Exercisable stock options		1,656,636
Weighted average number of shares outstanding
Weighted Average Exercise Price Outstanding Stock Options		$ 1.09
Weighted Average Exercise Price, Exercised Options		1.35
Weighted Average Exercise Price, Forfeited Options		2.42
Weighted Average Exercise Price Outstanding Stock Options		0.99	$ 1.09
Weighted Average Exercise Price, Exercisable Options		$ 0.99
Weighted Average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term		4 years 2 months 23 days	5 years 10 days
Weighted Average Remaining Contractual Term		4 years 2 months 23 days	5 years 10 days
Weighted Average Remaining Contractual Term, Exercisable		4 years 2 months 23 days
Aggregate Intrinsic Value [Abstract]
Average Intrinsic Value, Outstanding	[1]	$ 16,226
Average Intrinsic Value, Outstanding	[1]	3,761	$ 16,226
Average Intrinsic Value, Exercisable	[1]	$ 3,761

[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 September 30, 2015 and December 31, 2014, respectively.