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Basis of Presentation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]        
Percentage of ownership, equity method (in hundredths) 20.00%   20.00%  
Reclassified from other income (expense) to equity in earnings $ 346,000 $ 348,000 $ 1,099,000 $ 786,000
Minimum [Member] | Majority-owned Subsidiaries [Member]
       
Schedule of Equity Method Investments [Line Items]        
Percentage of ownership, equity method (in hundredths) 20.00%   20.00%  
Maximum [Member] | Majority-owned Subsidiaries [Member]
       
Schedule of Equity Method Investments [Line Items]        
Percentage of ownership, equity method (in hundredths) 50.00%   50.00%