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Postretirement Benefit Cost - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Retirement Benefits [Abstract]
Service costs	$ 1,714	$ 2,001	$ 3,427	$ 4,003
Interest costs	521	469	1,042	938
Expected return on plan assets	(334)	(287)	(668)	(575)
Net periodic benefit cost	$ 1,901	$ 2,183	$ 3,801	$ 4,366

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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