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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Comprehensive income:        
Net income $ 89,792 $ 97,299 $ 208,195 $ 213,904
Derivative instruments:        
Net fair value increase (decrease), net of tax of $3, $(11), $1, and $(7), respectively 5 (20) 2 (13)
Reclassification of gains to net income, net of tax of $(72), $(71), $(145), and $(145), respectively (117) (118) (237) (236)
Other comprehensive loss (112) (138) (235) (249)
Comprehensive income $ 89,680 $ 97,161 $ 207,960 $ 213,655