Post-retirement Plans (Changes in Benefit Obligation and Plan Assets) (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Pension plan's benefit obligation - beginning of year		$ 18,992	$ 21,201
Service cost	$ 3,598	1,511	1,294	$ 1,694
Interest cost	1,979	987	787	819
Participant contributions		181	244
Amendments		0	21
Benefits paid		(1,800)	(2,171)
Actuarial loss (gain)		1,058	(2,384)
Foreign currency exchange rate changes		358	0
Pension plan's benefit obligation - end of year	29,499	29,499	18,992	21,201
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning of year		0	0
Employer contributions		1,542	1,927
Fair value of plan assets - end of year	0	0	0	$ 0
Participant contributions		258	244
Under-funded balance	(29,499)	(29,499)	(18,992)
Accrued post-retirement plan liability	(29,499)	(29,499)	(18,992)
Cumulative actuarial (loss) gain	(287)	(287)	771
Prior service credit	28,953	28,953	32,434
Total	28,666	28,666	$ 33,205
Business Combination Acquiree [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
PCLI acquisition		8,212
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Pension plan's benefit obligation - beginning of year	52,155
Service cost	3,598
Interest cost	1,979
Benefits paid	(966)
Actuarial loss (gain)	4,503
Foreign currency exchange rate changes	2,313
Pension plan's benefit obligation - end of year	63,582	63,582
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning of year	51,870
Actual return on plans assets	6,182
Foreign currency exchange rate changes	2,175
Fair value of plan assets - end of year	59,261	59,261
Under-funded balance	(4,321)	(4,321)
Accrued post-retirement plan liability	(4,321)	(4,321)
Cumulative actuarial (loss) gain	$ 1,162	$ 1,162