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Lease Obligations	12 Months Ended
Lease Obligations	Dec. 31, 2017
Leases [Abstract]
Lease Obligations	Lease Obligations The Company and its subsidiaries use office space and equipment under leases expiring at various dates. These leases are considered operating leases for financial reporting purposes. Some of these leases have options to extend the length of the leases and contain clauses for cost of living, operating expense and real estate tax adjustments. Future minimum lease payments, without provision for sublease income, are: $50,117,000 in 2018; $41,326,000 in 2019; $38,721,000 in 2020; $34,982,000 in 2021, 29,720,000 in 2022 and $92,086,000 thereafter. Rental expense was $52,925,000, $47,453,000, and $46,271,000 for 2017, 2016, and 2015 respectively.