Supplemental Condensed Consolidating Financial Information (Narrative) (Details)	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Ownership percentage in directly owned subsidiary	100.00%
7% Senior Notes Due 2018 [Member]
Condensed Financial Statements, Captions [Line Items]
Ownership percentage in directly owned subsidiary	100.00%

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant