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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Consolidated Statements of Comprehensive Income    
Net margins including noncontrolling interest $ 17,585 $ 19,946
Other comprehensive loss:    
Unrealized loss on securities available for sale (22) (16)
Reclassification adjustment for actuarial (gain) loss on postretirement benefit obligation included in net income (22) 9
Other comprehensive loss (44) (7)
Comprehensive income including noncontrolling interest 17,541 19,939
Net comprehensive (income) loss attributable to noncontrolling interest (52) 180
Comprehensive income attributable to the Association $ 17,489 $ 20,119