Identified Intangible Assets and Goodwill, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Acquired finite-lived intangible assets [line Items]
Finite-lived intangible assets, gross	$ 30,488	$ 29,118
Accumulated amortization	26,417	24,311
Identified intangibles, net	4,071	4,807
Goodwill	30,305	29,474
Identified intangible assets and goodwill, net	$ 34,376	34,281
Customer lists/relationships
Acquired finite-lived intangible assets [line Items]
Finite-lived intangible assets, remaining amortization period	2 years 7 months 6 days
Finite-lived intangible assets, gross	$ 17,822	16,805
Accumulated amortization	$ 15,171	13,764
Employment-related
Acquired finite-lived intangible assets [line Items]
Finite-lived intangible assets, remaining amortization period	2 years 7 months 6 days
Finite-lived intangible assets, gross	$ 7,032	6,811
Accumulated amortization	$ 6,386	6,008
Tradenames
Acquired finite-lived intangible assets [line Items]
Finite-lived intangible assets, remaining amortization period	2 years 7 months 6 days
Finite-lived intangible assets, gross	$ 5,634	5,502
Accumulated amortization	$ 4,860	$ 4,539