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Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011
Segment and Geographic Information
Number of operating segments	1
Number of geographic segments	1
Cash, Cash Equivalents and Restricted Cash
Restricted cash	$ 628,000	$ 381,000
Silver Creek
Principles of consolidation
Ownership interest (as a percent)	74.00%	74.00%

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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