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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net income $ 68,354us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 56,453us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:    
Basic weighted average shares outstanding (in shares) 76,242,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 80,648,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - Stock options and awards (in shares) 817,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 968,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average shares outstanding (in shares) 77,059,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 81,616,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per share    
Basic earnings per share (in dollars per share) $ 0.90us-gaap_EarningsPerShareBasic $ 0.70us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share) $ 0.89us-gaap_EarningsPerShareDiluted $ 0.69us-gaap_EarningsPerShareDiluted
Anti-dilutive shares excluded from the computation of diluted earnings per share 407,290us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 263,415us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount