Summary of Significant Accounting Policies (Details 4) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Net income loss available to common stockholders
Net income	$ 2,983	$ (19,273)	$ 4,852	$ (18,693)
Net income applicable to preferred stock	291		474
Net income applicable to common stock	$ 2,692		$ 4,378
Determination of shares:
Weighted-average common shares outstanding (in shares)	79,758,000		79,580,000
Assumed conversion of dilutive employee stock-based awards (in shares)	2,298,000		2,301,000
Assumed conversion of restricted stock (in shares)	49,000		60,000
Diluted weighted-average common shares outstanding before participating security	82,105,000	78,458,000	81,941,000	78,189,000
Assumed conversion of preferred stock (in shares)	8,624,000		8,624,000
Diluted weighted-average common shares outstanding (in shares)	90,729,000		90,565,000
Anti-dilutive securities, options to purchase shares outstanding			1,604,583	7,217,679
Calculation of basic EPS:
Net income applicable to common stock	$ 2,692		$ 4,378
Weighted-average common shares outstanding (in shares)	79,758,000		79,580,000
Basic earnings (loss) per common share (in dollars per share)	$ 0.03	$ (0.25)	$ 0.06	$ (0.24)
Calculation of diluted EPS using two-class method:
Net income applicable to common stock	$ 2,692	$ (19,273)	$ 4,378	$ (18,693)
Diluted weighted-average common shares outstanding before participating security	82,105,000	78,458,000	81,941,000	78,189,000
Diluted EPS	$ 0.03	$ (0.25)	$ 0.05	$ (0.24)
Calculation of basic and diluted EPS:
Net Income (Loss) Attributable to Parent	$ 2,983	$ (19,273)	$ 4,852	$ (18,693)
Series C Preferred stock
Earnings Per Share
Preferred stock , shares outstanding	8,624	8,624	8,624	8,624	8,624