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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities      
Net income including the noncontrolling interests in subsidiaries $ 294,901 $ 221,514 $ 171,986
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities      
Amortization of deferred sales commissions 8,025 11,980 15,054
Depreciation and other amortization 10,637 9,578 9,535
Share-based compensation expense 22,508 22,445 22,685
(Gain) loss on disposal of assets (7,193) 1,070 3,413
(Benefit) provision for deferred income taxes (59,272) 17,496 19,263
Fair-value adjustments for contingent liabilities 0 320 415
Impairment of assets 0 1,637 1,342
Net sales (purchases) of trading securities 17,024 (8,099) (11,388)
Consolidation/deconsolidation of investment companies 0 (176) 213
Adoption of new accounting pronouncement 0 (2,653) 0
Deferred sales commissions paid (4,715) (11,801) (13,898)
Contingent deferred sales charges received 1,785 2,195 2,350
Other changes in assets and liabilities:      
Increase in receivables, net (8,657) (11,120) (5,505)
(Increase) decrease in prepaid expenses and other assets (291) (5,126) 4,471
(Decrease) increase in accounts payable and accrued expenses (9,160) 6,001 5,451
Increase (decrease) in other liabilities 4,785 (2,490) 7,797
Net cash provided by operating activities 270,377 252,771 233,184
Investing Activities      
Purchases of securities available for sale (8,129) (3,345) (5,461)
Cash paid for business acquisitions (4,352) 0 0
Proceeds from redemptions of securities available for sale 140,249 7,990 5,756
Cash paid for property and equipment (9,799) (12,839) (6,026)
Net cash provided (used) by investing activities 117,969 (8,194) (5,731)
Financing Activities      
Dividends paid (101,511) (205,468) (104,628)
Purchases of treasury stock (48,642) (81,771) (53,868)
Distributions to noncontrolling interests in subsidiaries (10,337) (18,291) (5,686)
Contributions from noncontrolling interests in subsidiaries 4,687 17,868 16,409
Cash paid for amended and restated credit agreement (483) 0 0
Payments on contingent consideration liabilities (684) (640) (2,015)
Proceeds from shareholders for share-based compensation 1,299 1,436 1,552
Excess tax benefits from share-based compensation 0 0 3,644
Payments on debt (21,250) (25,500) (25,500)
Net cash used by financing activities (176,921) (312,366) (170,092)
Net increase (decrease) in cash and cash equivalents 211,425 (67,789) 57,361
Cash and cash equivalents, beginning of year 104,839 172,628 115,267
Cash and cash equivalents, end of year 316,264 104,839 172,628
Supplemental Disclosure of Cash Flow Information, Cash paid during the year for:      
Income taxes 118,412 104,581 77,247
Interest $ 4,109 $ 3,487 $ 3,985