Investments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]          
Investments $ 11,462   $ 11,462   $ 11,901
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Income (Loss) from Equity Method Investments 599 441 1,024 1,189  
Equity Method Investment, Dividends or Distributions     1,463 2,100  
Finite-Lived Intangible Assets, Amortization Expense 4,958 4,326 9,929 8,815  
Detroit Legal News Publishing Llc [Member]
         
Schedule of Equity Method Investments [Line Items]          
Investments 10,923   10,923   11,334
Percent Ownership 35.00%   35.00%    
Underlying Finite Lived Customer List Net Of Amortization     5,152   5,906
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Income (Loss) from Equity Method Investments 609 459 1,051 1,216  
Equity Method Investment, Dividends or Distributions 763 700 1,463 2,100  
Finite-Lived Intangible Assets, Amortization Expense 377 377 754 754  
Other Equity Method [Member]
         
Schedule of Equity Method Investments [Line Items]          
Investments 539   539   567
Percent Ownership 19.50%   19.50%    
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]          
Income (Loss) from Equity Method Investments $ (10) $ (18) $ (27) $ (27)