Acquisitions (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Business Acquisition [Line Items]
Maximum contingent consideration due in 2014	$ 6,391
Maximum contingent consideration due in 2015	1,870
Maximum contingent consideration due in Total	8,261
Bath Consulting [Member]
Business Acquisition [Line Items]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	2,376
Maximum contingent consideration due in 2014	997
Maximum contingent consideration due in 2015	0
Maximum contingent consideration due in Total	997
Asentus [Member]
Business Acquisition [Line Items]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	3,700
Maximum contingent consideration due in 2014	1,600
Maximum contingent consideration due in 2015	0
Maximum contingent consideration due in Total	1,600
Prospero [Member]
Business Acquisition [Line Items]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	4,675
Maximum contingent consideration due in 2014	2,805
Maximum contingent consideration due in 2015	1,870
Maximum contingent consideration due in Total	4,675
Lorien [Member]
Business Acquisition [Line Items]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	989
Maximum contingent consideration due in 2014	989
Maximum contingent consideration due in 2015	0
Maximum contingent consideration due in Total	$ 989