Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

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

A December 31 measurement date is used for all of the defined benefit and postretirement plans. The status of these plans as of December 31, 2015 and 2014 is summarized below (dollars in thousands):

	December 31,
	Pension Benefits						Other Benefits
	2015			2014			2015			2014
Change in benefit obligation:
Benefit obligation at beginning of year	$	138,196		$	111,195		$	59,782		$	30,759
Service cost	9,222			8,121			4,062			2,354
Interest Cost	5,035			4,972			2,572			1,962
Participant contributions	—			—			229			174
Actuarial (gains) losses	(1,919		)	18,930			(2,729		)	25,354
Benefits paid	(4,480		)	(3,044		)	(609		)	(821		)
Foreign exchange translations and other adjustments	(3,815		)	(1,978		)	—			—
Benefit obligation at end of year	$	142,239		$	138,196		$	63,307		$	59,782

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

	December 31,
	Pension Benefits						Other Benefits
	2015			2014			2015			2014
Change in plan assets:
Fair value of plan assets at beginning of year	$	66,757		$	59,559		$	—		$	—
Actual return on plan assets	(2,795		)	2,489			—			—
Employer contributions	8,953			7,753			380			647
Participant contributions	—			—			229			174
Benefits paid and expenses	(4,480		)	(3,044		)	(609		)	(821		)
Fair value of plan assets at end of year	$	68,435		$	66,757		$	—		$	—
Funded status at end of year	$	(73,804	)	$	(71,439	)	$	(63,307	)	$	(59,782	)

Schedule of Net Funded Status [Table Text Block]

	December 31,
	Qualified Plans						Non-Qualified Plans(1)						Total
	2015			2014			2015			2014			2015			2014
Aggregate fair value of plan assets	$	68,435		$	66,757		$	—		$	—		$	68,435		$	66,757
Aggregate projected benefit obligations	83,870			80,104			58,369			58,092			142,239			138,196
Under funded	$	(15,435	)	$	(13,347	)	$	(58,369	)	$	(58,092	)	$	(73,804	)	$	(71,439	)

(1) For non-qualified plans, there are no required funding levels.

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	December 31,
	Pension Benefits				Other Benefits
	2015		2014		2015		2014
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss	$	41,814	$	41,238	$	27,755	$	32,949
Net prior service cost	1,159		1,496		—		—
Total	$	42,973	$	42,734	$	27,755	$	32,949

Schedule Of Projected Benefit Obligations In Excess Of Fair Value Of Plan Assets [Table Text Block]

The following table presents information for qualified and non-qualified pension plans with a projected benefit obligation in excess of plan assets as of December 31, 2015 and 2014 (dollars in thousands):

	2015		2014
Projected benefit obligation	$	142,239	$	138,196
Fair value of plan assets	68,435		66,757

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The following table presents information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31, 2015 and 2014 (dollars in thousands):

	2015		2014
Accumulated benefit obligation	$	140,442	$	135,850
Fair value of plan assets	68,435		66,757

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

The components of net periodic benefit cost and other changes in plan assets and benefit obligations recognized in other comprehensive income were as follows (dollars in thousands):

	Pension Benefits									Other Benefits
	2015			2014			2013			2015			2014			2013
Net periodic benefit cost:
Service cost	$	9,222		$	8,121		$	8,023		$	4,062		$	2,354		$	1,881
Interest cost	5,035			4,972			4,072			2,572			1,962			1,353
Expected return on plan assets	(4,897		)	(4,471		)	(3,734		)	—			—			—
Amortization of prior actuarial losses	3,429			1,755			3,270			2,465			1,060			868
Amortization of prior service cost	309			333			373			—			—			—
Net periodic benefit cost	13,098			10,710			12,004			9,099			5,376			4,102
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial (gains) losses	5,774			20,912			(11,250		)	(2,729		)	25,354			(5,949		)
Amortization of actuarial (gains) losses	(3,429		)	(1,755		)	(3,270		)	(2,465		)	(1,060		)	(868		)
Amortization of prior service cost (credit)	(309		)	(333		)	(373		)	—			—			—
Foreign exchange translations and other adjustments	(1,797		)	(578		)	(439		)	—			—			—
Total recognized in other comprehensive income	239			18,246			(15,332		)	(5,194		)	24,294			(6,817		)
Total recognized in net periodic benefit cost and other comprehensive income	$	13,337		$	28,956		$	(3,328	)	$	3,905		$	29,670		$	(2,715	)

Schedule of Expected Benefit Payments [Table Text Block]

The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (dollars in thousands):

	Pension Benefits		Other Benefits
2016	$	10,993	$	753
2017	8,228		913
2018	8,141		1,095
2019	10,200		1,281
2020	9,533		1,535
2021-2025	57,489		11,534

Schedule of Assumptions Used [Table Text Block]

Weighted average assumptions used to determine the accumulated benefit obligation and net benefit cost or income were as follows:

	Pension Benefits						Other Benefits
	2015		2014		2013		2015		2014		2013
Discount rate used to determine benefit obligation	3.99	%	3.90	%	4.45	%	4.43	%	4.05	%	5.05	%
Discount rate used to determine net benefit cost or income	3.77	%	4.30	%	3.83	%	4.05	%	5.05	%	4.15	%
Expected long-term rate of return on plan assets	7.35	%	7.35	%	7.35	%	—	%	—	%	—	%
Rate of compensation increases	4.08	%	4.08	%	4.21	%	—	%	—	%	—	%

Schedule of Health Care Cost Trend Rates [Table Text Block]

The assumed health care cost trend rates used in measuring the accumulated non-pension post-retirement benefit obligation were as follows:

	December 31,
	2015	2014
Pre-Medicare eligible claims	8% down to 5% in 2020	8% down to 5% in 2018
Medicare eligible claims	8% down to 5% in 2020	8% down to 5% in 2018

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

A one-percentage point change in assumed health care cost trend rates would have the following effects (dollars in thousands):

	One Percent Increase		One Percent Decrease
Effect on total of service and interest cost components	$	1,694	$	(1,226	)
Effect on accumulated postretirement benefit obligation	$	13,659	$	(10,254	)

Schedule of Allocation of Plan Assets [Table Text Block]

The fair values of the Company’s pension plan assets as of December 31, 2015 and 2014 are summarized below (dollars in thousands):

	December 31, 2015
			Fair Value Measurement Using:
	Total		Level 1		Level 2		Level 3
Mutual Funds(1)	$	68,349	$	68,349	$	—	$	—
Cash	86		86		—		—
Total	$	68,435	$	68,435	$	—	$	—

(1) Mutual funds were invested 32% in U.S. equity funds, 38% in U.S. fixed income funds, 15% in non-U.S. equity funds and 15% in other.

	December 31, 2014
			Fair Value Measurement Using:
	Total		Level 1		Level 2		Level 3
Mutual Funds(2)	$	66,675	$	66,675	$	—	$	—
Cash	82		82		—		—
Total	$	66,757	$	66,757	$	—	$	—

(2) Mutual funds were invested 32% in U.S. equity funds, 30% in U.S. fixed income funds, 22% in non-U.S. equity funds and 16% in other.