Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Compensation and Other Benefit Plans - Stock Option Activity (Details) - Stock Options [Member] - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock option activity [Roll Forward]      
Outstanding at beginning of year (in shares) 384,382 384,948 360,658
Granted (in shares) 234,962 89,844 94,487
Exercised (in shares) 0 (8,177) (45,737)
Forfeited, expired or cancelled (in shares) (51,052) (82,233) (24,460)
Outstanding at end of year (in shares) 568,292 384,382 384,948
Exercisable at end of year (in shares) 315,384 280,149 245,346
Stock options activity, weighted average exercise price [Roll Forward]      
Outstanding at beginning of year (in dollars per share) $ 126.46 $ 162.88 $ 168.05
Granted (in dollars per share) 6.29 75.56 133.88
Exercised (in dollars per share)   37.89 78.18
Forfeited, expired or cancelled (in dollars per share) 116.15 250.17 285.31
Outstanding at end of year (in dollars per share) 77.70 126.46 162.88
Exercisable at end of year (in dollars per share) 127.08 138.29 199.22
Weighted average grant date fair value (in dollars per share) $ 4.90 $ 51.92 $ 98.85