|
Segment And Geographic Information (Segment Table) (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Dec. 31, 2013
|
|
| Segment Reporting Information [Line Items] | |||||
| Net revenues | $ 309,299 | $ 283,956 | $ 664,207 | $ 500,030 | |
| Income before income taxes | 174,209 | 133,926 | 392,353 | 216,149 | |
| Assets | 40,155,499 | 40,155,499 | 37,870,700 | ||
|
Electronic Brokerage [Member]
|
|||||
| Segment Reporting Information [Line Items] | |||||
| Net revenues | 220,600 | 212,500 | 444,300 | 407,800 | |
| Income before income taxes | 131,400 | 123,300 | 265,700 | 234,300 | |
| Assets | 34,560,600 | 34,560,600 | 31,333,500 | ||
|
Market Making [Member]
|
|||||
| Segment Reporting Information [Line Items] | |||||
| Net revenues | 91,900 | 67,400 | 225,000 | 91,000 | |
| Income before income taxes | 46,500 | 7,600 | 134,600 | (21,400) | |
| Assets | 12,190,700 | 12,190,700 | 12,139,500 | ||
|
Corporate And Eliminations [Member]
|
|||||
| Segment Reporting Information [Line Items] | |||||
| Net revenues | (3,200) | 4,000 | (5,100) | 1,200 | |
| Income before income taxes | (3,700) | 3,000 | (8,000) | 3,200 | |
| Assets | $ (6,595,800) | $ (6,595,800) | $ (5,602,300) | ||