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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
Tax cuts and jobs act of 2017 complete accounting current income tax expense benefit $ 16,100    
Tax cuts and jobs act of 2017 complete accounting change in provisional estimate income tax expense benefit 3,100    
Reduction in corporate tax rate amount $ 500    
Corporate tax rate 21.00% 35.00% 35.00%
Tax cuts and jobs act of 2017 complete accounting deemed repatriation federal tax $ 5,200    
Tax cuts and jobs act of 2017 complete accounting deemed repatriation federal taxes payable period 8 years    
Tax cuts and jobs act of 2017 complete accounting estimated payments of liability $ 1,100    
Tax cuts and jobs act of 2017 complete accounting alternative minimum tax credit percentage 50.00%    
Tax cuts and jobs act of 2017 complete accounting repatriation tax restoration income tax receivable $ 4,000    
Tax cuts and jobs act of 2017, complete accounting, change in tax rate, foreign income tax credits 800    
Deferred Tax Assets, Gross 36,484 $ 38,146  
Deferred Tax Assets, Tax Credit Carryforwards 9,156 6,654  
Deferred Tax, Operating Loss Carryforwards 4,707 5,195  
Valuation allowance 3,356 4,010  
Valuation Allowance Operating Loss Carryforwards Change In Amount (600)    
Liability for uncertain tax positions 400 1,700  
Increase (decrease) in uncertain tax liability including interest and penalties   1,300  
Income Taxes Paid 27,300 14,600 $ 14,100
Continuing Operations      
Operating Loss Carryforwards [Line Items]      
Expected tax position to be resolved or settled   300  
Foreign Income Tax Credit      
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Tax Credit Carryforwards 5,200    
Alternative Minimum Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward   4,000  
Federal And State      
Operating Loss Carryforwards [Line Items]      
Tax cuts and jobs act of 2017 complete accounting deemed repatriation of foreign earnings 2,600    
U.S      
Operating Loss Carryforwards [Line Items]      
Valuation allowance 3,400 4,000  
U.S | Foreign Income Tax Credit      
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Tax Credit Carryforwards $ 4,900    
Tax credit carryforward expiration year 2021    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards $ 2,900    
Valuation Allowance Operating Loss Carryforwards Change In Amount 900    
Foreign Tax Authority | Foreign Income Tax Credit | United Kingdom      
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Tax Credit Carryforwards 300    
State and Foreign      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 49,100 68,400  
Deferred Tax, Operating Loss Carryforwards 4,700 $ 5,200  
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating Loss Carryforwards 1,800    
Valuation Allowance Operating Loss Carryforwards Change In Amount $ (1,500)    
State and Local Jurisdiction | Latest Tax Year      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward expiration year 2019    
State and Local Jurisdiction | Earliest Tax Year      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward expiration year 2038