XML 123 R97.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation (Summary of Equity-Classified Stock Option Activity) (Details) - Stock Options [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Options, Outstanding at January 1, 2018 6,020,000 5,416,000 5,623,000
Number of Options, Granted 0 1,604,000 155,000
Number of Options, Exercised 0 0 (45,000)
Number of Options, Forfeited or expired (842,000) (1,000,000) (317,000)
Number of Options, Outstanding at December 31, 2018 5,178,000 6,020,000 5,416,000
Weighted Average Exercise Price, Outstanding at January 1, 2018 $ 19.43 $ 23.46 $ 24.57
Weighted Average Exercise Price, Granted   8.00 8.60
Weighted Average Exercise Price, Exercised     7.74
Weighted Average Exercise Price, Forfeited or expired 33.99 22.93 38.01
Weighted Average Exercise Price, Outstanding at December 31, 2018 $ 17.06 $ 19.43 $ 23.46