Business Acquisitions Business Acquisitions (Details 3) (New Eezy Gro Inc, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jan. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			$ 9,600
Weighted average useful life	9 years	[1]
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			1,200
Weighted average useful life	10 years
Customer list
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			5,500
Weighted average useful life	10 years
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			2,100
Weighted average useful life	5 years
Noncompete agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			$ 800
Weighted average useful life	7 years

[1] weighted average number of years