Condensed Consolidating Financial Statements (Details Textual) (Guarantor Subsidiaries [Member])	Dec. 31, 2012
Guarantor Subsidiaries [Member]
Condensed Consolidating Financial Statements (Textual) [Abstract]
Percentage of ownership of guarantor subsidiaries	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