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Supplemental Schedule of Noncash Financing Activities	12 Months Ended
Supplemental Schedule of Noncash Financing Activities	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Schedule of Noncash Financing Activities	Supplemental schedule of noncash financing activities: During 2017 there were 6,134 shares, totaling $398 thousand, used to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vesting. During 2016 there were 17,185 shares, totaling $998 thousand, used to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vesting. As of December 31, 2016 there were 109,475 shares totaling $6.4 million of share repurchases that were not settled until January 2017. As of December 31, 2015 there were 25,000 shares totaling $820 thousand of share repurchases that were not settled until January 2016.