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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	10. Stockholders’ Equity At December 31, 2017 and 2016, treasury stock consisted of 3,561,509 shares and 3,470,084 shares of common stock, respectively. During 2017, 57,963 shares of Company common stock were purchased in the open market and 18,827 shares of Company common stock were purchased from Company Retirement Plans. In addition, 22,598 shares were received to settle employees’ minimum statutory withholding taxes related to performance stock awards, exercised SARs and deferred compensation distributions. Also, 7,965 shares of treasury stock were distributed to participants under the Company’s deferred compensation plan.