Stock Based Compensation Nonvested Stock Option Activity (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Granted	1,348,504	1,389,452
Nonvested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Stock Option Shares Outstanding, Beginning Balance	2,770,662	3,110,523
Granted	1,348,504	1,389,452
Vested	(1,425,483)	(1,522,152)
Forfeited	(197,265)	(207,161)
Stock Option Shares Outstanding, Ending Balance	2,496,418	2,770,662
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested Weighted Average Grant Date Fair Value, Beginning balance	$ 3.74	$ 4.69
Granted	3.08	3.00
Vested	4.22	4.92
Forfeited	3.27	4.38
Nonvested Weighted Average Grant Date Fair Value, Ending balance	$ 3.15	$ 3.74