Income Taxes Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 3.5

Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the United States that are not subject to U.S. federal income taxes.

No definition available.

Name:	us-gaap_UndistributedEarningsOfForeignSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant