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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF EQUITY      
Issuance of restricted shares of common stock 109,318us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 100,902us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 72,083us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Issuance of shares of common stock upon exercise of stock options 43,034us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 303,536us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 62,575us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Purchase of shares of common stock 34,293us-gaap_TreasuryStockSharesAcquired 163,222us-gaap_TreasuryStockSharesAcquired 9,175us-gaap_TreasuryStockSharesAcquired
Other comprehensive income before reclassifications, tax $ 641us-gaap_OtherComprehensiveIncomeLossTax $ 2,316us-gaap_OtherComprehensiveIncomeLossTax $ 1,315us-gaap_OtherComprehensiveIncomeLossTax