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Statements of Shareholder's Equity (USD $)
In Thousands
Total
Common Stock
Additional capital paid-in
Retained income
Accumulated other comprehensive income
Balance at Dec. 31, 2011       $ 597,045us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 194,511us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Change in unrealized net capital gains and losses 48,626ck0000839759_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax       48,626ck0000839759_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income 50,154us-gaap_NetIncomeLoss     50,154us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Change in unrealized foreign currency translation adjustments (417)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax       (417)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2012 1,032,948us-gaap_StockholdersEquity 2,500us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
140,529us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
647,199us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
242,720us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Change in unrealized net capital gains and losses (91,316)ck0000839759_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax       (91,316)ck0000839759_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income 40,295us-gaap_NetIncomeLoss     40,295us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Change in unrealized foreign currency translation adjustments 853us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax       853us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2013 982,780us-gaap_StockholdersEquity 2,500us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
140,529us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
687,494us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
152,257us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Change in unrealized net capital gains and losses 18,293ck0000839759_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax       18,293ck0000839759_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesIncludingOtherThanTemporaryImpairmentLossesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net income 125,962us-gaap_NetIncomeLoss     125,962us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
 
Change in unrealized foreign currency translation adjustments (934)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax       (934)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance at Dec. 31, 2014 $ 1,126,101us-gaap_StockholdersEquity $ 2,500us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 140,529us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 813,456us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 169,616us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember