Consolidated Statements of Financial Condition (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 245,875	$ 284,188
Cash restricted or segregated under regulations and other	61,117	71,496
Deposits with clearing organizations	29,149	25,538
Securities owned, at fair value	10,086	5,277
Receivables from brokers, dealers and clearing organizations	1,107,119	871,315
Receivables from customers	546,825	472,509
Premises and equipment, net	54,989	43,023
Capitalized software, net	43,994	51,258
Goodwill		274,292
Other intangibles, net	35,227	39,594
Income taxes receivable	7,460	6,838
Deferred taxes	39,155	16,493
Other assets	15,763	16,248
Total assets	2,196,759	2,178,069
Liabilities:
Accounts payable and accrued expenses	165,062	181,224
Short-term bank loans	22,154	1,606
Payables to brokers, dealers and clearing organizations	1,337,459	1,079,773
Payables to customers	226,892	207,738
Securities sold, not yet purchased, at fair value	5,249	438
Income taxes payable	10,608	11,460
Deferred taxes	293	719
Term debt	19,272	23,997
Total liabilities	1,786,989	1,506,955
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $0.01 par value; 1,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.01 par value; 100,000,000 shares authorized; 52,037,011 and 51,899,229 shares issued at December 31, 2012 and 2011, respectively	520	519
Additional paid-in capital	245,002	249,469
Retained earnings	405,485	653,344
Common stock held in treasury, at cost; 14,677,872 and 12,679,948 shares at December 31, 2012 and 2011, respectively	(253,111)	(240,559)
Accumulated other comprehensive income (net of tax)	11,874	8,341
Total stockholders' equity	409,770	671,114
Total liabilities and stockholders' equity	$ 2,196,759	$ 2,178,069