Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Goodwill [Roll Forward]
Balances, December 31	$ 137,683		$ 105,255
Retirement Services segment
Goodwill [Roll Forward]
Balances, January 1	105,255		105,255
Acquisitions	32,428	[1]	0	[1]
Balances, December 31	$ 137,683		$ 105,255

[1] 2014, the Company acquired goodwill of $32,428 from the acquisition of RPS. See Note 2 for additional discussion regarding the acquisition.