Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Business Acquisition [Line Items]
Maximum contingent consideration due in 2014	$ 5,310
Maximum contingent consideration due in 2015	1,808
Maximum contingent consideration due in Total	7,118
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	4,520
Maximum contingent consideration due in 2014	2,712
Maximum contingent consideration due in 2015	1,808
Maximum contingent consideration due in Total	4,520
Lorien [Member]
Business Acquisition [Line Items]
Original range of potential undiscounted payments minimum	0
Original range of potential undiscounted payments maximum	998
Maximum contingent consideration due in 2014	998
Maximum contingent consideration due in 2015	0
Maximum contingent consideration due in Total	$ 998