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EARNINGS PER COMMON SHARE (DETAILS) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Basic earnings per common share
Net income									$ 804,564us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 727,465us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 547,241us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Less: noncontrolling interests									(6,181)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Less: preferred share dividends									40,088us-gaap_PreferredStockDividendsIncomeStatementImpact	40,474us-gaap_PreferredStockDividendsIncomeStatementImpact	38,228us-gaap_PreferredStockDividendsIncomeStatementImpact
Less: loss on repurchase of preferred shares									0us-gaap_PreferredStockRedemptionPremium	3,081us-gaap_PreferredStockRedemptionPremium	14,009us-gaap_PreferredStockRedemptionPremium
Net income available to common shareholders	163,663us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	279,104us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	190,664us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	137,227us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	171,524us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	137,121us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	72,447us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	302,816us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	770,657us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	683,910us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	495,004us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average number of common shares outstanding - basic									104,368us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,636us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	122,148us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share	$ 1.63us-gaap_EarningsPerShareBasic	$ 2.71us-gaap_EarningsPerShareBasic	$ 1.81us-gaap_EarningsPerShareBasic	$ 1.26us-gaap_EarningsPerShareBasic	$ 1.55us-gaap_EarningsPerShareBasic	$ 1.23us-gaap_EarningsPerShareBasic	$ 0.63us-gaap_EarningsPerShareBasic	$ 2.59us-gaap_EarningsPerShareBasic	$ 7.38us-gaap_EarningsPerShareBasic	$ 6.02us-gaap_EarningsPerShareBasic	$ 4.05us-gaap_EarningsPerShareBasic
Diluted earnings per common share
Net income available to common shareholders	$ 163,663us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 279,104us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 190,664us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 137,227us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 171,524us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 137,121us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 72,447us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 302,816us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 770,657us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 683,910us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 495,004us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average number of common shares outstanding - basic									104,368us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	113,636us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	122,148us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock compensation plans									1,345us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,692us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,506us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of common shares outstanding - diluted									105,713us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	115,328us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	123,654us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share	$ 1.60us-gaap_EarningsPerShareDiluted	$ 2.68us-gaap_EarningsPerShareDiluted	$ 1.79us-gaap_EarningsPerShareDiluted	$ 1.24us-gaap_EarningsPerShareDiluted	$ 1.52us-gaap_EarningsPerShareDiluted	$ 1.21us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted	$ 2.55us-gaap_EarningsPerShareDiluted	$ 7.29us-gaap_EarningsPerShareDiluted	$ 5.93us-gaap_EarningsPerShareDiluted	$ 4.00us-gaap_EarningsPerShareDiluted
Anti-dilutive shares excluded from the dilutive computation									282us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	250us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	614us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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