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Retirement Benefits	12 Months Ended
Retirement Benefits	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Retirement Benefits	Retirement Benefits The Corporation has defined contribution profit-sharing plans covering substantially all employees who are not participants in certain defined benefit plans. The Corporation’s annual contribution to the defined contribution plans is based on employee eligible earnings and results of operations and amounted to $32.5 million, $29.1 million, and $26.8 million, in 2016, 2015, and 2014, respectively. A portion of the annual contribution is in the form of common stock of the Corporation. The amount of the stock contribution was $7.2 million, $6.8 million, and $6.4 million in 2016, 2015, and 2014, respectively. The Corporation sponsors a defined benefit plan which covers a limited number of former salaried and hourly members. The Corporation’s funding policy is generally to contribute annually the minimum actuarially computed amount. Net pension costs relating to these plans were $376,000, $281,000 and $167,000, in 2016, 2015 and 2014, respectively. The actuarial present value of obligations, less related plan assets at fair value, is not significant.