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Consolidated Statements of Earnings (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]      
Loss on discontinued operations, related tax benefit $ 40us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 417us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation $ 801us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation