Commitments and Contingencies, Variable Interest Entities (Details) (Low-Income Housing Limited Partnerships [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Low-Income Housing Limited Partnerships [Member]
Amounts Reflected in Consolidated Balance Sheets [Abstract]
Current assets	$ 223	$ 357
Property, plant and equipment, net	2,427	2,599
Other noncurrent assets	112	105
Total assets	2,762	3,061
Current liabilities	233	1,388
Mortgages and other long-term debt payable	1,687	617
Other noncurrent liabilities	42	39
Total liabilities	$ 1,962	$ 2,044