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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets, operating loss, and other carryforwards            
Provision (benefit) for income taxes $ (1,702) $ 2,558 $ (943) $ 2,994    
Deferred tax assets, foreign and state NOL           $ 20,900
Net operating loss (NOL) carryforwards           120,500
Deferred tax assets, valuation allowance           $ 12,800
Income taxes paid 3,900   $ 10,900      
Statutory tax rate     21.00%     35.00%
Long-term income taxes payable 9,141   $ 9,141     $ 12,848
Forecast            
Deferred tax assets, operating loss, and other carryforwards            
Provision (benefit) for income taxes         $ 2,000  
Adjustment            
Deferred tax assets, operating loss, and other carryforwards            
Long-term income taxes payable $ 2,500   $ 2,500      
Foreign tax credit carryforwards            
Deferred tax assets, operating loss, and other carryforwards            
Other deductible carryforwards           $ 31,200