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Treasury Stock	3 Months Ended
Treasury Stock	Mar. 31, 2018
Equity [Abstract]
Treasury Stock	Treasury Stock Common stock held in treasury totaled 653,767 and 644,091 with a cost of $1,482 and $1,472 at March 31, 2018 and December 31, 2017, respectively. These shares were withheld from employees to settle personal tax withholding obligations that arose as a result of restricted stock units that have vested in the periods presented.