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Retirement Agreements and Other Postretirement Benefit Plan (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) h | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
DefinedContributionPlanMinimumNumberOfMonthsEmployedEligibility | 3 months |  |
Minimum number of years employed in order to participate in the 401(k) plan | 1 year |  |
Minimum number of hours worked annually in order to participate in the 401(k) plan | h | 1,000 |  |
Defined contribution plan contribution percent | 3.00% |  |
Expenses related to the 401(k) plan | $ 1,577,000 | $ 810,000 | $ 741,000
Amount accrued for all deferred compensation plan agreements | 9,492,000 | 8,487,000 |
Amount recognized in accumulated other comprehensive income, before tax | (87,191) | (165,437) | (173,812)
Amount recognized in accumulated other comprehensive income, net of tax | (57,556) | $ (109,200) | $ (114,726)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2018 | 11,789 |  |
2019 | 13,343 |  |
2020 | 14,913 |  |
2021 | 16,501 |  |
2022 | 24,250 |  |
Next 5 years thereafter | $ 174,283 |  |
Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Noncompete period following employment | 2 years |  |

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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