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Employee Benefit Plans (Change on Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation:    
Benefit Obligation, beginning of year $ 22,530 $ 0
Service Cost 5,153 1,749
Interest Cost 862 267
Actuarial (Gain) Loss (3,816) 992
Benefits Paid (218) (56)
Acquisition of Alkali Business 0 19,578
Benefit Obligation, end of year 24,511 22,530
Change in plan assets:    
Fair Value of Plan Assets, beginning of year 13,306 0
Actual Return (loss) on Plan Assets (1,300) 647
Employer Contributions 3,928 2,250
Benefits Paid (218) (56)
Acquisition of Alkali Business 0 10,465
Fair Value of Plan assets, end of year 15,716 13,306
Funded Status at end of period (8,795) (9,224)
Amounts recognized in the Consolidated Balance Sheet:    
Non-current assets 0 0
Current liabilities 0 0
Non-current Liabilities (8,795) (9,224)
Net Liability at end of year (8,795) (9,224)
Amounts recognized in accumulated other comprehensive income (loss):    
Net actuarial (gain) loss (939) 604
Amounts recognized in accumulated other comprehensive income ( loss:) $ (939) $ 604