Restricted Deposits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Restricted Cash and Investments [Abstract]
Maximum Time Period Proceeds From LKE Sale Maintained with Third Party Intermediary	180 days
Restricted Cash and Cash Equivalents	$ 651	[1]	$ 10,559	[1]

[1] Restricted cash is recorded in "Other Assets" and represents the proceeds from LKE sales deposited with a third-party intermediary.