Supplemental Consolidated Balance Sheet Information (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 03, 2017	Mar. 31, 2017	Mar. 31, 2016
Supplemental Consolidated Balance Sheet Information [Line Items]
Loans issued		$ 1,000	$ 0
Employee retention and signing bonuses, term, years		6 years
Sign-on and retention bonuses issued		$ 2,700	6,500
Property and equipment recorded		13,800
Capital expenditures accrued		3,400
Contingent acquisition liability adjustments, net		1,199
Remeasurement of acquisition-related contingent consideration		1,199
Performance-based long-term incentive compensation liabilities		3,000
Technology Infrastructure and Software [Member]
Supplemental Consolidated Balance Sheet Information [Line Items]
Property and equipment recorded		2,500
Leasehold Improvements [Member]
Supplemental Consolidated Balance Sheet Information [Line Items]
Property and equipment recorded		6,400
Furniture [Member]
Supplemental Consolidated Balance Sheet Information [Line Items]
Property and equipment recorded		$ 1,500
Maximum [Member]
Supplemental Consolidated Balance Sheet Information [Line Items]
Lease expiration		Dec. 31, 2028
Healthcare [Member] | McKinnis Consulting Services, LLC [Member] | Subsequent Event [Member]
Supplemental Consolidated Balance Sheet Information [Line Items]
Payment to the selling members for undistributed cash held in the business as of the closing	$ 10,000
Restricted Stock Units (RSUs) [Member]
Supplemental Consolidated Balance Sheet Information [Line Items]
Vesting period		3 years