Common Stock and Other Equity Related Transactions Common Stock and Other Equity Related Transactions - Employee Stock Purchase Program (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Stock Purchase Program [Line Items]
Employee Stock Purchase Program purchase price discount	85.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans	19,788	30,739	18,411
Employee Stock Purchase Plan
Employee Stock Purchase Program [Line Items]
Amendment Date	May 3, 2006
Maximum
Employee Stock Purchase Program [Line Items]
Employee Stock Purchase Program Authorized Amount	$ 250,000
Number Of Shares Authorized Employee Stock Purchase Plan	2,000,000