Acquisitions (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
	Jan. 31, 2017	Jan. 06, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition
Acquired intangibles											$ 514	$ 10,318
Acquired goodwill											0	34,069
Net loss on asset disposals and other transactions			$ (109)	$ (224)	$ (769)	$ (31)	$ (498)	$ (51)	$ (136)	$ (1,103)	(1,133)	(1,788)	$ (431)
Goodwill			$ 132,631				$ 132,631				$ 132,631	$ 132,631	$ 98,562
Marietta, Ohio financial advisory book of business [Member]
Business Acquisition
Total purchase price		$ 500
Subsequent Event [Member] | Insurance third party administrator [Member]
Business Acquisition
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period	$ 400