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Income Taxes, Operating Loss Carryovers, Tax Reconciliation and Tax Cuts and Jobs Act (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]          
Deferred tax liabilities, held for sale     $ 600    
Operating Loss Carryforwards [Abstract]          
Operating loss carryovers, tax credit     40,600    
Increase in valuation allowance for deferred tax assets, related to operating losses     6,800    
2017 Tax Act [Abstract]          
Provisional income tax expense   $ 18,400      
Provisional income tax expense, change in amount       $ (6,600)  
Income tax expense       11,800  
Valuation Allowance [Abstract]          
Valuation allowance [1]     $ (54,326) $ (50,702)  
Increase in valuation allowance amount $ 16,200        
Effective tax rate reconciliation [Abstract]          
Taxes at statutory rate     21.00% 21.00% 35.00%
State income taxes, net of federal income tax benefit     2.20% 1.10% 0.30%
Tax credits     (2.60%) (1.50%) (1.10%)
Taxes on foreign earnings     5.10% (0.40%) 0.20%
Global Intangible Low-Taxed Income     0.90% 0.60% 0.00%
Resolution of prior years' tax matters     (0.40%) (0.30%) 0.10%
U.S. manufacturing deduction     0.00% 0.00% (1.40%)
Valuation allowance adjustments     (8.80%) 0.40% 0.00%
2017 Tax Legislation     0.00% (3.70%) 12.40%
Loss on foreign branch remittances     0.00% 0.00% (5.20%)
U.S. tax accounting method changes     0.00% (2.90%) 0.00%
Other, net     1.40% (1.00%) (0.70%)
Effective tax rate     18.80% 13.30% 39.60%
Foreign [Member]          
Operating Loss Carryforwards [Abstract]          
Operating loss carryovers     $ 120,900    
Operating loss carryovers, subject to expiration     26,100    
Operating loss carryovers, not subject to expiration     94,800    
State [Member]          
Operating Loss Carryforwards [Abstract]          
Operating loss carryovers     135,800    
Operating loss carryovers, subject to expiration     $ 135,800    
[1] In the first quarter of 2019, the Company recognized an increase in its foreign tax credit carryover and corresponding valuation allowance of $16.2 million, related to the finalization of certain tax regulations.