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Investments (Tables)
3 Months Ended
Mar. 31, 2013
Investments [Abstract]  
Schedule of equity method investments
As of March 31, 2013, our investments in joint ventures consisted of equity ownership interests in the following entities:

Company
 
Approximate %
Ownership
Metro Boston LLC
 
49
%
Donohue Malbaie Inc.
 
49
%
Madison Paper Industries
 
40
%

In the first quarter of 2013, we recorded a nominal charge for the impairment of our investment in quadrantONE LLC as a result of its February 2013 announcement, of the wind down of its operations.