Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance [Line Items]        
Valuation allowance $ 161,511 $ 85,393 $ 43,269 $ 53,199
Foreign earnings that will be indefinitely reinvested 18,500      
Liability for income taxes associated with uncertain tax positions 7,900 8,700    
Unrecognized tax benefits that would impact tax rate 7,800 8,200    
Income tax interest and penalties 6,300 6,500 $ 6,100  
Federal        
Valuation Allowance [Line Items]        
Net operating loss carryforwards 374,500 283,500    
State        
Valuation Allowance [Line Items]        
Net operating loss carryforwards 161,200 146,200    
Foreign        
Valuation Allowance [Line Items]        
Net operating loss carryforwards 220,100 124,000    
Domestic Deferred Tax Assets        
Valuation Allowance [Line Items]        
Valuation allowance 104,100 59,400    
Foreign Deferred Tax Assets        
Valuation Allowance [Line Items]        
Valuation allowance $ 57,400 $ 26,000