Annual report pursuant to Section 13 and 15(d)

Compensation and Other Benefit Plans - Stock Option Activity (Details)

v3.3.1.900
Compensation and Other Benefit Plans - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock options activity, weighted average exercise price [Roll Forward]      
Weighted average grant date fair value (in dollars per share) $ 2.60 $ 4.49 $ 2.27
Stock Options [Member]      
Stock option activity [Roll Forward]      
Outstanding at beginning of year (in shares) 7,702,309 7,216,041 6,788,383
Granted (in shares) 1,797,222 1,891,989 1,168,203
Exercised (in shares) (163,663) (915,911) (589,355)
Forfeited, expired or cancelled (in shares) (1,645,571) (489,810) (151,190)
Outstanding at end of year (in shares) 7,690,297 7,702,309 7,216,041
Exercisable at end of year (in shares) 5,604,615 4,908,925 4,814,926
Stock options activity, weighted average exercise price [Roll Forward]      
Outstanding at beginning of year (in dollars per share) $ 8.15 $ 8.42 $ 8.99
Granted (in dollars per share) 3.78 6.69 3.13
Exercised (in dollars per share) 1.89 3.91 2.26
Forfeited, expired or cancelled (in dollars per share) 12.51 14.36 17.46
Outstanding at end of year (in dollars per share) 6.33 8.15 8.42
Exercisable at end of year (in dollars per share) $ 6.93 $ 9.98 $ 11.14