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Investment in Unconsolidated Entities, Deconsolidation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Deconsolidation of New York Partnerships      
Investments in unconsolidated entities $ 401,720 $ 301,772 $ 321,729
St. Lawrence Seaway RSA Cellular Partnership      
Deconsolidation of New York Partnerships      
Ownership interest in equity method investment 60.00%    
New York RSA 2 Cellular Partnership      
Deconsolidation of New York Partnerships      
Ownership interest in equity method investment 57.14%    
St. Lawrence Seaway RSA Cellular Partnership and New York RSA 2 Cellular Partnership      
Deconsolidation of New York Partnerships      
Date Of Deconsolidation Apr. 03, 2013    
Deconsolidation gain   $ 14,500