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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
ASSETS    
Accumulated depreciation $ 228,211us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 220,028us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
STOCKHOLDERS' EQUITY:    
Preferred stock, par value (in dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 75,000,000us-gaap_CommonStockSharesAuthorized 75,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 49,001,429us-gaap_CommonStockSharesIssued 48,671,492us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 49,001,429us-gaap_CommonStockSharesOutstanding 48,671,492us-gaap_CommonStockSharesOutstanding