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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Income tax expense (benefit) on discontinued operations $ 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ (3,813)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation