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Postretirement Benefit Obligations - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Retirement Benefits [Abstract]
Service costs	$ 2,001	$ 1,908	$ 6,004	$ 5,724
Interest costs	469	333	1,407	999
Expected return on plan assets	(287)	(76)	(862)	(228)
Net periodic benefit cost	$ 2,183	$ 2,165	$ 6,549	$ 6,495

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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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