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Share-Based Compensation - Summary of Unvested Restricted Stock Awards (Details) - Restricted Stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Shares      
Unvested shares/units outstanding at beginning of period 8,556 7,643 15,328
Granted (in shares) 2,928 6,367 7,462
Vested (in shares) (5,186) (3,432) (13,395)
Forfeited / Canceled (in shares) (672) (2,022) (1,752)
Unvested shares/units outstanding at end of period 5,626 8,556 7,643
Weighted- Average Grant Date Fair Value (usd per share)      
Unvested restricted shares outstanding at beginning of period (in usd per share) $ 6.39 $ 6.92 $ 8.07
Granted (in usd per share) 0.88 6.17 6.32
Vested (in usd per share) 4.95 7.04 7.85
Forfeited / Canceled (in usd per share) 6.38 6.60 7.33
Unvested restricted shares outstanding at end of period (in usd per share) $ 4.85 $ 6.39 $ 6.92