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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
EARNINGS PER SHARE    
Net income available for stockholders: $ 7,548us-gaap_NetIncomeLoss $ 39,388us-gaap_NetIncomeLoss
Less: Dividends paid (22,762)us-gaap_DividendsCommonStock (22,986)us-gaap_DividendsCommonStock
Undistributed earnings $ (15,214)us-gaap_UndistributedEarnings $ 16,402us-gaap_UndistributedEarnings
Basic shares outstanding:    
Common stock 210,069us-gaap_WeightedAverageNumberOfSharesIssuedBasic 211,434us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Restricted shares of common stock 3,423us-gaap_WeightedAverageNumberOfSharesRestrictedStock 3,741us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Basic shares outstanding, Total 213,492us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 215,175us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted shares outstanding:    
Common stock 210,069res_WeightedAverageNumberOfSharesIssuedDiluted 211,434res_WeightedAverageNumberOfSharesIssuedDiluted
Dilutive effect of stock based awards 93us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,039us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted shares outstanding excluding restricted shares of common stock, Total 210,162res_WeightedAverageNumberOfDilutedSharesOutstandingIncludingCommonStockAndDilutiveEffectOfStockOption 212,473res_WeightedAverageNumberOfDilutedSharesOutstandingIncludingCommonStockAndDilutiveEffectOfStockOption
Restricted shares of common stock 3,423us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends 3,741us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends
Diluted shares outstanding, Total 213,585us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 216,214us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding