Post-retirement Plans (PCLI Pension) (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 Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		$ 200
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Pension plan's benefit obligation - beginning of year		29,499	$ 18,992
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]
Fair value of plan assets - beginning of year		0	0
Employer contributions		1,676	1,542
Participant contributions		255	258
Fair value of plan assets - end of year	0	0	0	$ 0
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 Plan Disclosure [Line Items]
Actual return on plans assets	6,182	3,599
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Pension plan's benefit obligation - beginning of year	52,155	63,582
PCLI acquisition		0	8,212
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]
Fair value of plan assets - beginning of year	51,870	59,261
Employer contributions	0	6,239
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
Foreign currency exchange rate changes	$ 2,175	(5,208)
Underfunded Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		1,000
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		13,100
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		2,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		1,300
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		1,500
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		$ 1,800