Segments, Major Customers (Details)	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011 Customer Concentration Risk [Member] Customer	Jun. 30, 2011 Customer Concentration Risk [Member] Customer
Concentration Risk [Line Items]
Number of Customers Accounting for Ten Percent or More of Net Revenues			0	0
Entity-Wide Revenue, Major Customer, Percentage	12.00%	14.00%

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration