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, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost		$ 1,648	$ 1,511	$ 1,294
Interest cost		938	987	787
Participant contributions		178	181
Benefits paid		(1,931)	(1,800)
Actuarial loss (gain)		(2,643)	1,058
Foreign currency exchange rate changes		(809)	358
Pension plan's benefit obligation - end of year	$ 29,499	26,880	29,499	18,992
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Employer contributions		1,676	1,542
Fair value of plan assets - end of year	0	0	0	$ 0
Participant contributions		255	258
Under-funded balance	(29,499)	(26,880)	(29,499)
Accrued post-retirement plan liability	(29,499)	(26,880)	(29,499)
Cumulative actuarial (loss) gain	(287)	2,379	(287)
Prior service credit	28,953	25,473	28,953
Total	28,666	27,852	28,666
Business Combination Acquiree [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	59,261	34,145	59,261
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	63,582	36,144	63,582
PCLI acquisition		0	8,212
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Service cost	3,598	4,420
Interest cost	1,979	2,249
Benefits paid	(966)	(1,429)
Actuarial loss (gain)	4,503	1,058
Foreign currency exchange rate changes	2,313	(5,445)
Pension plan's benefit obligation - end of year	63,582	64,435	63,582
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Actual return on plans assets	6,182	3,599
Employer contributions	0	6,239
Foreign currency exchange rate changes	2,175	(5,208)
Fair value of plan assets - end of year	59,261	62,462	59,261
Under-funded balance	(4,321)	(1,973)	(4,321)
Accrued post-retirement plan liability	(4,321)	(1,973)	(4,321)
Cumulative actuarial (loss) gain	$ 1,162	$ 1,977	$ 1,162