Summary of Significant Accounting Policies (Investments in Unconsolidated Affiliates) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Net difference between investment and underlying equity in unconsolidated affiliates, amortization period (in years)	40 years
Net difference between investment and underlying equity in unconsolidated affiliates	$ 11,674	$ 2,456

Net Difference of Investment in Unconsolidated Affiliates and the Equity of Unconsolidated Affiliates, Amortization Period in Years

No definition available.

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration