Stock-based Compensation - Equity Awards (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent attainment of performance goals required					100.00%
2007 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, grants in period	205	25	760	94
Total grants in period	352	25	2,522	358
2007 Stock Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grants in period	47	0	212	92
Semi-annual performance period multiplier, maximum			2.75
Performance multiplier maximum			2.5
2007 Stock Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options, grants in period	100	0	1,550	172
$3.45 Average Closing Stock Price [Member] | 2007 Stock Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percent			50.00%
Duration of trading period stock price must be maintained			30 days
Required average closing stock price (usd per share)			$ 3.45
Award performance period			3 years
$4.25 Average Closing Stock Price [Member] | 2007 Stock Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percent			50.00%
Duration of trading period stock price must be maintained			30 days
Required average closing stock price (usd per share)			$ 4.25
Award performance period			4 years