Commitments and Contingencies, Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amounts Reflected in Consolidated Balance Sheets [Abstract]
Current assets	$ 357	$ 270
Property, plant and equipment, net	2,599	2,727
Other noncurrent assets	105	102
Total assets	3,061	3,099
Current liabilities	1,388	1,389
Mortgages and other long-term debt payable	617	640
Other noncurrent liabilities	39	43
Total liabilities	$ 2,044	$ 2,072