Employee Benefit Plans Defined Benefit Plan Change in Benefit Obligations and Plan Assets Table (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation	$ (30,300)	$ (39,030)
Service costs	(1,050)	(1,120)	$ (1,150)
Interest costs	(1,070)	(1,100)	(1,290)
Participant contributions	(60)	(60)
Actuarial gain (loss)	(4,190)	3,020
Benefit payments	900	1,200
Defined Benefit Plan, Benefit Obligation, Annuity Purchase	0	5,480
Settlements and curtailments	0	210
Change in foreign currency	(810)	1,100
Defined Benefit Plan, Benefit Obligation	(36,580)	(30,300)	(39,030)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets	24,650	31,760
Actual return on plan assets	3,630	(1,520)
Employer contributions	1,930	2,440
Participant contributions	60	60
Benefit payments	(900)	(1,200)
Defined Benefit Plan, Plan Assets, Annuity Purchase	0	5,480
Settlements	0	(210)
Change in foreign currency	890	(1,200)
Fair value of plan assets	30,260	24,650	$ 31,760
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded Status at December 31	$ (6,320)	$ (5,650)