Acquisitions (Identifiable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Jan. 02, 2015
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	10 years 1 month 28 days
Securities Service Network, Inc. (SSN)
Acquired Indefinite-lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 30,901
Securities Service Network, Inc. (SSN) \| Relationships with financial advisors
Acquired Indefinite-lived Intangible Assets [Line Items]
Identifiable intangible assets		26,654
Useful Life		20 years
Securities Service Network, Inc. (SSN) \| Developed technology
Acquired Indefinite-lived Intangible Assets [Line Items]
Identifiable intangible assets		2,080
Useful Life		12 years 6 months
Securities Service Network, Inc. (SSN) \| Trade names
Acquired Indefinite-lived Intangible Assets [Line Items]
Identifiable intangible assets		1,756
Useful Life		9 years
Securities Service Network, Inc. (SSN) \| Non-compete agreements
Acquired Indefinite-lived Intangible Assets [Line Items]
Identifiable intangible assets		$ 411
Useful Life		3 years