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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Consolidated Statements of Comprehensive Income    
Net income $ 203,042us-gaap_NetIncomeLoss $ 173,182us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of income taxes:    
Unrealized depreciation on securities, net of income taxes of $26.6 million at December 31, 2014 and $1.9 million at December 31, 2013 (42,244)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (2,961)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Minimum pension liability adjustments, net of income taxes of ($0.1) million at December 31, 2014 and December 31, 2013 196us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent 147us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Other comprehensive loss (42,048)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (2,814)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 160,994us-gaap_ComprehensiveIncomeNetOfTax $ 170,368us-gaap_ComprehensiveIncomeNetOfTax