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Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Interest Costs Capitalized	$ 0.6	$ 0.6
Real Estate Property, Capitalized Of Indirect Costs	2.1	1.6
Deferred Costs	9.6		8.1
Restricted Cash and Cash Equivalents	$ 109.1
Acquisition Of Remaining Ownership Interests	48.00%

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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