XML 13 R48.htm IDEA: XBRL DOCUMENT v2.4.0.6
Incentive Plans (Details)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Summary of activity in outstanding grants  
Outstanding grants, beginning of the period 870,760
Grants during the year 272,150
Grants vested and paid during the year (187,096)
Forfeitures during the year (832)
Outstanding grants, end of the period 954,982