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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF EQUITY      
Issuance of restricted shares of common stock 13,664 95,095 100,005
Issuance of shares of common stock upon exercise of stock options 158,021 35,081 43,053
Purchase of shares of common stock 171,907 234,746 70,686
Other comprehensive income (loss), tax $ 637 $ 679 $ 677