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Goodwill and Other Intangible Assets (Schedule of Goodwill and Other Intangible Assets Included in Equity Method Investments) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Other intangible assets    
Gross amount, End of Period $ 57,322  
Accumulated impairment losses and amortization, End of Period (29,786)  
Other intangible assets, Net, End of Period 27,536  
Goodwill and Other intangible assets, Total    
Goodwill and Other intangible assets, Net, End of Period 8,894 14,690
Investments in Other Ventures, Under Equity Method [Member]
   
Goodwill    
Goodwill, Gross amount, Beginning of Period 8,477 8,477
Accumulated impairment losses and amortization, Beginning of Period 0 0
Goodwill, Net, Beginning of Period 8,477 8,477
Acquired during the year 544 0
Impairment losses 0 0
Goodwill, Gross amount, End of Period 9,021 8,477
Accumulated impairment losses and amortization, End of Period 0 0
Goodwill, Net, End of Period 9,021 8,477
Other intangible assets    
Gross amount, Beginning of Period 44,323 44,323
Accumulated impairment losses and amortization, Beginning of Period (14,659) (8,989)
Other intangible assets, Net, Beginning of Period 29,664 35,334
Acquired during the year 0 0
Amortization (5,161) (5,670)
Impairment losses 0 0
Gross amount, End of Period 44,323 44,323
Accumulated impairment losses and amortization, End of Period (19,820) (14,659)
Other intangible assets, Net, End of Period 24,503 29,664
Goodwill and Other intangible assets, Total    
Gross amount, Beginning of Period 52,800 52,800
Accumulated impairment losses and amortization, Beginning of Period (14,659) (8,989)
Goodwill and Other intangible assets, Net, Beginning of Period 38,141 43,811
Acquired during the year 544 0
Amortization (5,161) (5,670)
Impairment losses 0 0
Gross amount, End of Period 53,344 52,800
Accumulated impairment losses and amortization, End of Period (19,820) (14,659)
Goodwill and Other intangible assets, Net, End of Period $ 33,524 $ 38,141