Stock-based Compensation - Equity Awards (Details) (2007 Stock Plan [Member]) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	25	1,253	94	1,746
Equity awards granted during the period, total, Grants in Period, Gross	25	1,423	358	1,959
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	75	92	82
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	95	172	131
Share-based Compensation Arrangement by Share-based Payment Award, Options, Semi-Annual Performance Period Multiplier, Maximum			2.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Performance Multiplier Maximum			2.5