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Nature of Operations and Summary of Significant Accounting Policies Other Investments (Details)
 12 Months Ended
Dec. 31, 2013
Investment In Limited Partnerships Accounting Treatment [Line Items]  
Maximum ownership percentage that is not consolidated 50.00%
Investment in corporations minimum ownership percentage for accounting for using the equity method 20.00%
Investment in corporations maximum ownership percentage for accounting for at cost 20.00%
Investment in limited partnerships maximum ownership percentage for accounting for at cost 3.00%
Minimum
  
Investment In Limited Partnerships Accounting Treatment [Line Items]  
Investment in limited partnerships ownership percentage for accounting for using the equity method 3.00%
Maximum
  
Investment In Limited Partnerships Accounting Treatment [Line Items]  
Investment in limited partnerships ownership percentage for accounting for using the equity method 50.00%