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Retirement Plans	12 Months Ended
Retirement Plans	Dec. 31, 2017
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans Our defined contribution retirement plans include a 401(k) plan, which is funded, and a supplemental plan for certain employees, which is unfunded. The expense of our defined contribution retirement plans was $660,000 in 2017, $978,000 in 2016 and $1,060,000 in 2015. The unfunded liability for our supplemental plan was $374,000 at year-end 2017 and $334,000 at year-end 2016 and is included in other liabilities.