Lease Obligations	12 Months Ended
Lease Obligations	Dec. 31, 2011
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. The Company also has an investment in a commercial office building that has a long-term land lease. Future minimum lease payments, without provision for sublease income, are: $34,635,000 in 2012; $31,177,000 in 2013; $26,808,000 in 2014; $22,646,000 in 2015 and $173,015,000 thereafter. Rental expense was $33,003,000, $29,936,000 and $28,067,000 for 2011, 2010 and 2009, respectively.

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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