Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Net periodic benefit cost (income) for our pension and other postretirement plans consists of the following (in thousands):

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended September 30,						Three Months Ended September 30,
	2016			2015			2016			2015
Components of Net Periodic Benefit Cost (Income)
Service cost	$	2,939		$	3,091		$	123		$	132
Interest cost	6,553			6,544			198			197
Expected return on plan assets	(7,062		)	(7,890		)	(261		)	(242		)
Amortization of prior service cost	62			62			(471		)	(471		)
Recognized actuarial loss	2,472			2,659			78			96
Net Periodic Benefit Cost (Income)	$	4,964		$	4,466		$	(333	)	$	(288	)

	Pension Benefits						Other Postretirement Benefits
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2016			2015			2016			2015
Components of Net Periodic Benefit Cost (Income)
Service cost	8,819			$	9,272		$	369		$	395
Interest cost	19,658			19,631			596			590
Expected return on plan assets	(21,186		)	(23,671		)	(782		)	(727		)
Amortization of prior service cost	185			185			(1,412		)	(1,412		)
Recognized actuarial loss	7,416			7,976			236			289
Net Periodic Benefit Cost (Income)	$	14,892		$	13,393		$	(993	)	$	(865	)