The following table presents additional information about exercises of stock options:
| (in thousands) | For the years ended December 31, | |||||||||||
| 2013 | 2012 | 2011 | ||||||||||
Cash received upon exercise | $ | 42,976 | $ | 121,665 | $ | 24,491 | ||||||
Intrinsic value (market value on date of exercise less exercise price) | 25,552 | 59,985 | 10,101 | |||||||||