Stockholders' Equity Stockholders' Equity (Employee Stock Purchase Plan) (Narrative) (Details) (2002 Employee Stock Purchase Plan [Member])	12 Months Ended
	Dec. 31, 2013
2002 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price as a percent of closing price	85.00%
Common stock purchase period	6 months
Common stock look-back period	6 months
Maximum percent employees can invest of their gross compensation through payroll deductions	15.00%
Maximum number of shares employee can purchase	8,334
Shares available for future issuance	2,785,721