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Nature Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) - segment
12 Months Ended
Dec. 31, 2015
Jan. 02, 2009
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]    
Number of operating Segments 3  
Number of reportable segments 2  
Terra and Magnus [Member]    
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]    
Number of reportable segments 1  
Yankee Environmental Services, LLC [Member]    
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]    
Acquired membership interest   65.00%
Minimum [Member]    
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]    
Average equipment-related costs of total costs of contract revenue 20.00%  
Maximum [Member]    
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]    
Average equipment-related costs of total costs of contract revenue 22.00%