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Treasury Stock	12 Months Ended
Treasury Stock	Dec. 31, 2017
TreasuryStockTextBlockAbstract
Treasury Stock	TREASURY STOCK Common shares held in treasury totaled 644,091 and 354,889 with a cost of $1,472 and $1,214 at December 31, 2017 and 2016, respectively. These shares were withheld from employees to settle personal tax withholding obligations that arose as a result of restricted stock units that vested during the current and prior years.