Business Acquisitions and Divestitures (Narrative) (Details) (USD $)	12 Months Ended		1 Months Ended				59 Months Ended	1 Months Ended	38 Months Ended	1 Months Ended	12 Months Ended		37 Months Ended	6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 31, 2014	Aug. 31, 2014	Feb. 28, 2014	Feb. 28, 2010	Dec. 31, 2014	Nov. 30, 2010	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2014	Jun. 30, 2012	Jan. 31, 2012	Nov. 30, 2012
Business Acquisitions (Textual) [Abstract]
Value of shares issued in business acquisition	$ 1,279,000	$ 1,472,000
Goodwill	13,036,000	13,686,000					13,036,000		13,686,000		13,669,000		13,036,000
Adjacent Services [Member] | Chicago, Illinois [Member]
Business Acquisitions (Textual) [Abstract]
Proceeds from sale of divested assets			1,100,000
Loss on sale of divested assets (less than)			(100,000)
Contingent consideration which may be received, earn-out payments			900,000
Etesius Limited [Member]
Business Acquisitions (Textual) [Abstract]
Payments for business acquisition						3,100,000
Payment of contingent consideration				200,000	700,000		1,400,000
Etesius Limited [Member] | Initial payment [Member]
Business Acquisitions (Textual) [Abstract]
Payments for business acquisition						2,800,000
Etesius Limited [Member] | Obligations [Member]
Business Acquisitions (Textual) [Abstract]
Payments for business acquisition						300,000
Etesius Limited [Member] | Deferred Payments [Member]
Business Acquisitions (Textual) [Abstract]
Contingent consideration, liability						1,200,000
Contingent consideration, payment term						4 years
Etesius Limited [Member] | Potential Additional Variable Payments (Earn Out) [Member]
Business Acquisitions (Textual) [Abstract]
Contingent consideration, payment term						4 years
Contingent consideration, liability, maximum						3,800,000
TJG Holdings LLC [Member] | Initial payment [Member]
Business Acquisitions (Textual) [Abstract]
Payments for business acquisition								2,300,000
Contingent consideration, liability		0						1,400,000	0
Contingent consideration, liability, maximum								1,900,000
Payment of contingent consideration									1,900,000
Earn-out period for contingent consideration								2 years
Total estimated purchase price								3,700,000
Increase in contingent consideration liability									(500,000)
CRC Management Consultants LLP [Member]
Business Acquisitions (Textual) [Abstract]
Total estimated purchase price															1,000,000
QFS Limited [Member]
Business Acquisitions (Textual) [Abstract]
Total estimated purchase price														400,000
Nordic Profit Provider AB [Member]
Business Acquisitions (Textual) [Abstract]
Total estimated purchase price																100,000
Business Strategy, Inc. [Member]
Business Acquisitions (Textual) [Abstract]
Contingent consideration, liability	0						0						0
Payment of contingent consideration													6,300,000
Total estimated purchase price										11,900,000		11,900,000
Increase in contingent consideration liability										4,900,000			(1,400,000)
Revenue of acquiree recognized since acquisition date											10,900,000	800,000
Earnings of acquiree recognized since acquisition date											1,500,000	100,000
Business combination, adjustment to initial fair value accounting											12,200,000
Goodwill, reduction due to fair value adjustment											(200,000)
Business combination, decrease in fair value of purchase price												(200,000)
Goodwill										7,577,000		7,577,000
Goodwill, deductible for income tax purposes										1,500,000		1,500,000
Payment of contingent consideration, cash													3,600,000
Payment of contingent consideration, common stock (in shares)													404,775
Payment of contingent consideration, common stock, amount													2,700,000
Business Strategy, Inc. [Member] | Initial payment [Member]
Business Acquisitions (Textual) [Abstract]
Payments for business acquisition										2,800,000
Shares issued in business acquisition (in shares)										640,614
Value of shares issued in business acquisition										3,700,000
Business Strategy, Inc. [Member] | Additional payment [Member]
Business Acquisitions (Textual) [Abstract]
Payments for business acquisition														700,000
Business Strategy, Inc. [Member] | Performance Requirement [Member]
Business Acquisitions (Textual) [Abstract]
Contingent consideration, payment term										2 years
Contingent consideration, liability, maximum										5,500,000		5,500,000
Business Strategy, Inc. [Member] | Audit Claim Recovery [Member]
Business Acquisitions (Textual) [Abstract]
Contingent consideration, payment term										2 years
Contingent consideration, liability, maximum										$ 8,000,000.0		$ 8,000,000.0