XML 117 R81.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 12. Stock-Based Compensation Summary of Exercisable Stock Options (Details) - Options
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
$15.00 to $50.00  
Exercisable Stock Options, Additional Disclosures  
Options Vested | shares 2.4
Weighted Average Exercise Price | $ / shares $ 27.86
Aggregate Intrinsic Value | $ $ 6,300
Weighted Average Remaining Contractual Life 4 years 8 months
$50.01 and above  
Exercisable Stock Options, Additional Disclosures  
Options Vested | shares 0.1
Weighted Average Exercise Price | $ / shares $ 140.26
Aggregate Intrinsic Value | $ $ 0
Weighted Average Remaining Contractual Life 2 years 9 months