Ascade Acquisition (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Ascade Acquisition (Textual) [Abstract]
Cost of acquisition	$ 19
Purchase accounting for Ascade accounting to be completed before	Jul. 13, 2012
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
weighted-average estimated lives assigned to customer relationships and acquired other intangible assets	10 years
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
weighted-average estimated lives assigned to customer relationships and acquired other intangible assets	5 years
Acquired Technology Related Assets [Member]
Finite-Lived Intangible Assets [Line Items]
weighted-average estimated lives assigned to customer relationships and acquired other intangible assets	10 years