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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except 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
Numerator:                      
Net income $ 75,212us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 45,689us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 77,332us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 56,453us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 88,324us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 66,044us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 72,606us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 66,806us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 254,686us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 293,780us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 257,411us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:                      
Basic weighted average shares outstanding (in shares)                 79,185,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 81,978,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 83,087,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - stock options and awards (in shares)                 911,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,064,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,088,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average shares outstanding (in shares)                 80,096,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 83,042,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 84,175,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share (in dollars per share) $ 0.97us-gaap_EarningsPerShareBasic $ 0.58us-gaap_EarningsPerShareBasic $ 0.97us-gaap_EarningsPerShareBasic $ 0.70us-gaap_EarningsPerShareBasic $ 1.09us-gaap_EarningsPerShareBasic $ 0.81us-gaap_EarningsPerShareBasic $ 0.88us-gaap_EarningsPerShareBasic $ 0.81us-gaap_EarningsPerShareBasic $ 3.22us-gaap_EarningsPerShareBasic $ 3.58us-gaap_EarningsPerShareBasic $ 3.10us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) $ 0.96us-gaap_EarningsPerShareDiluted $ 0.57us-gaap_EarningsPerShareDiluted $ 0.96us-gaap_EarningsPerShareDiluted $ 0.69us-gaap_EarningsPerShareDiluted $ 1.07us-gaap_EarningsPerShareDiluted $ 0.80us-gaap_EarningsPerShareDiluted $ 0.87us-gaap_EarningsPerShareDiluted $ 0.80us-gaap_EarningsPerShareDiluted $ 3.18us-gaap_EarningsPerShareDiluted $ 3.54us-gaap_EarningsPerShareDiluted $ 3.06us-gaap_EarningsPerShareDiluted
Anti-dilutive shares excluded from the computation of diluted earnings per share                 260,090us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 45,850us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 107,814us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount