Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures Text Block

The components of net periodic benefit costs, included in other operating expenses on the condensed consolidated statements of income, for the three and nine months ended September 30, 2017 and 2016 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended September 30,						Three months ended September 30,
	2017			2016			2017			2016
Service cost	$	2,699		$	2,479		$	465		$	131
Interest cost	1,314			1,168			459			408
Expected return on plan assets	(1,554		)	(1,285		)	—			—
Amortization of prior service cost	85			76			(675		)	(467		)
Amortization of prior actuarial loss	1,081			1,040			580			137
Settlements	256			—			—			—
Net periodic benefit cost	$	3,881		$	3,478		$	829		$	209

	Pension Benefits						Other Benefits
	Nine months ended September 30,						Nine months ended September 30,
	2017			2016			2017			2016
Service cost	$	8,098		$	7,437		$	1,907		$	2,162
Interest cost	3,943			3,503			1,589			1,694
Expected return on plan assets	(4,662		)	(3,854		)	—			—
Amortization of prior service cost	254			229			(986		)	(467		)
Amortization of prior actuarial loss	3,244			3,121			1,494			1,370
Settlements	769			—			—			—
Net periodic benefit cost	$	11,646		$	10,436		$	4,004		$	4,759