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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Financial Position [Abstract]        
Common stock, par value (in dollars per share) $ 1.25us-gaap_CommonStockParOrStatedValuePerShare $ 1.25us-gaap_CommonStockParOrStatedValuePerShare    
Common stock, authorized 60,000,000us-gaap_CommonStockSharesAuthorized 60,000,000us-gaap_CommonStockSharesAuthorized    
Common stock, outstanding 34,167,430us-gaap_CommonStockSharesOutstanding 32,715,042us-gaap_CommonStockSharesOutstanding 31,653,262us-gaap_CommonStockSharesOutstanding 30,212,453us-gaap_CommonStockSharesOutstanding