Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2016

Retirement Plans [Abstract]

Schedule of Expected Benefit Payments [Table Text Block]

Benefit payments during the next ten years, which reflect applicable future service, are as follows:

Year Ended December 31,	Amount
(Dollars in thousands)
2017	$	1,203
2018	$	1,429
2019	$	1,405
2020	$	1,461
2021	$	1,433
Years 2022 to 2026	$	8,012

Periodic Pension Cost, Next Fiscal Year [Table Text Block]

The following is an estimate of the components of net periodic pension cost in 2017:

Estimated Year Ended December 31,	2017
(Dollars in thousands)
Service cost	$	—
Interest cost	1,189
Amortization of actuarial loss	270
Estimated 2017 net periodic pension cost	$	1,459

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

The following table summarizes the changes in plan benefit obligations:

Year Ended December 31,	2016			2015
(Dollars in thousands)
Change in benefit obligation
Beginning benefit obligation	$	28,399		$	30,047
Service cost	—			44
Interest cost	1,216			1,230
Actuarial gain	(464		)	(1,372		)
Benefit payments	(1,539		)	(1,550		)
Ending benefit obligation	$	27,612		$	28,399

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Year Ended December 31,	2016			2015
(Dollars in thousands)
Change in plan assets
Fair value of plan assets at beginning of year	$	—		$	—
Employer contribution	1,539			1,550
Benefit payments	(1,539		)	(1,550		)
Fair value of plan assets at end of year	$	—		$	—
Funded Status	$	(27,612	)	$	(28,399	)
Amounts recognized in the consolidated balance sheets consist of:
Accrued expenses	(1,177		)	(1,524		)
Other non-current liabilities	(26,435		)	(26,875		)
Net amount recognized	$	(27,612	)	$	(28,399	)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	$	5,692		$	6,492
Prior service cost	(1		)	(1		)
Net amount recognized, before tax effect	$	5,691		$	6,491
Weighted average assumptions used to determine benefit obligations:
Discount rate	4.4		%	4.4		%
Rate of compensation increase	3.0		%	3.0		%

Schedule of Net Benefit Costs [Table Text Block]

Components of net periodic pension cost are described in the following table:

Year Ended December 31,	2016			2015			2014
(Dollars in thousands)
Components of net periodic pension cost:
Service cost	$	—		$	44		$	84
Interest cost	1,216			1,230			1,171
Amortization of actuarial loss	335			535			328
Net periodic pension cost	$	1,551		$	1,809		$	1,583
Weighted average assumptions used to determine net periodic pension cost:
Discount rate	4.4		%	4.2		%	4.8		%
Rate of compensation increase	3.0		%	3.0		%	3.0		%