Employee Benefit Plans

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Employee Benefit Plans

Employee Benefit Plans

The components of net periodic benefit costs for the three and six months ended June 30, 2015 and 2014 were as follows (dollars in thousands):

	Pension Benefits						Other Benefits
	Three months ended June 30,						Three months ended June 30,
	2015			2014			2015		2014
Service cost	$	2,586		$	2,489		$	589	$	470
Interest cost	1,283			1,487			491		339
Expected return on plan assets	(1,331		)	(1,302		)	—		—
Amortization of prior service cost	80			216			—		—
Amortization of prior actuarial loss	833			245			265		217
Net periodic benefit cost	$	3,451		$	3,135		$	1,345	$	1,026

	Pension Benefits						Other Benefits
	Six months ended June 30,						Six months ended June 30,
	2015			2014			2015		2014
Service cost	$	4,616		$	3,990		$	1,178	$	940
Interest cost	2,526			2,295			982		677
Expected return on plan assets	(2,449		)	(2,235		)	—		—
Amortization of prior service cost	163			218			—		—
Amortization of prior actuarial loss	1,272			918			530		434
Net periodic benefit cost	$	6,128		$	5,186		$	2,690	$	2,051

The Company has made $4.0 million in pension contributions during the first six months of 2015, and does not expect to make any additional pension contributions in 2015.