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Dividends (Dividends Paid In Total And Per Share) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dividends [Abstract]      
Total paid $ 135,496,000us-gaap_PaymentsOfDividends $ 134,776,000us-gaap_PaymentsOfDividends $ 134,105,000us-gaap_PaymentsOfDividends
Per share (in dollars per share) $ 2.4625us-gaap_CommonStockDividendsPerShareCashPaid $ 2.4525us-gaap_CommonStockDividendsPerShareCashPaid $ 2.4425us-gaap_CommonStockDividendsPerShareCashPaid
Maximum dividend payable without prior permission of DOI of states domicile 177,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval    
Payments of ordinary dividends $ 225,000,000us-gaap_PaymentsOfOrdinaryDividends $ 120,000,000us-gaap_PaymentsOfOrdinaryDividends $ 145,000,000us-gaap_PaymentsOfOrdinaryDividends