Split-Dollar Life Insurance Premiums-Related Party (Details) (Co-trustees of The Philip and Margaret A. Isely Joint Trust Number One, USD $) In Millions, unless otherwise specified	0 Months Ended
	Jan. 01, 1994 item	Jun. 14, 2012
Co-trustees of The Philip and Margaret A. Isely Joint Trust Number One
Split-Dollar Life Insurance Premiums and Note Receivable-related party
Number of policies for which semiannual premium is paid by the entity each year	1
Rate of interest receivable on premiums paid (as a percent)	2.50%
Outstanding amounts for the premiums paid under the split-dollar life insurance agreement		$ 0.7
Outstanding amounts for the premiums paid and interest accrued per the loan agreement		0.2
Total receivable		$ 0.9