Derivative Financial Instruments (Details Textuals) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011
Additional Derivative Financial Instruments (Textuals) [Abstract]
Interest rate swaps associated with term loan borrowings	$ 500.0
Percentage of variable rate debt outstanding	71.00%

Name:

us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives

Namespace Prefix:

us-gaap

Data Type:

us-types:percentItemType

Balance Type:

na

Period Type:

instant