Intangible Assets (Schedule Of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 144,974	$ 141,818
Accumulated amortization	58,552	47,042
Net	86,422	94,776
Client Contracts And Broker Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	123,879	120,723
Accumulated amortization	43,437	33,885
Net	80,442	86,838
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,880	3,880
Accumulated amortization	2,218	1,657
Net	1,662	2,223
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	13,846	13,846
Accumulated amortization	10,658	9,390
Net	3,188	4,456
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,232	2,232
Accumulated amortization	1,852	1,798
Net	380	434
Favorable Lease [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,137	1,137
Accumulated amortization	387	312
Net	$ 750	$ 825