XML 35 R50.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2011
month
officer
Dec. 31, 2010
Accounts receivable
Customer concentration
customer
Dec. 31, 2010
Accounts receivable
Customer concentration
One customer with largest risk concentration
customer
Dec. 31, 2011
Accounts receivable
Customer concentration
Two customers with largest risk concentration, collectively
Dec. 31, 2010
Accounts receivable
Customer concentration
Two customers with largest risk concentration, collectively
customer
Dec. 31, 2011
Accounts receivable
Credit concentration
One customer with largest risk concentration
Dec. 31, 2010
Accounts receivable
Credit concentration
One customer with largest risk concentration
Principles of Consolidation              
Number of officers of general partner who are not also officers of entity 1            
Percentage of holders of the outstanding common units required to vote for removal of the general partner 66.667%            
Cash and Cash Equivalents              
Maximum original maturity in order to classify highly liquid money market accounts and debt instruments as cash equivalents (in months) 3            
Accounts Receivable, net              
Number of customers   2 1   2    
Customers individually representing greater than this percentage for disclosure       10.00% 10.00% 9.00% 12.00%
Percentage of concentration risk         22.00%