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Income Taxes - Narratives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 26, 2018
Dec. 31, 2015
Operating Loss Carryforwards          
Tax cuts and jobs act, income tax expense (benefit)   $ (53,400)      
Effective income tax rate (percent) 17.40% 143.30% 27.50%    
Remeasurement of uncertain tax positions $ 3,700        
Net deferred tax asset included in other long term assets 4,200        
Net deferred tax liability   $ 97,943      
Deferred tax assets 51,953 65,238   $ 52,200  
Valuation allowances 45,439 300   50,800  
Cumulative effect from adoption of new accounting principle     $ 1,200    
Unrecognized tax benefits 19,560 21,400 9,665   $ 11,998
Unrecognized tax benefits that would impact tax rate if recognized 8,800 9,600 3,100    
Accrued income tax interest and penalties 2,200 1,600 200    
Income tax interest and penalty expenses 700 1,400      
Indemnification asset 7,100 6,400      
Amount refunded 1,700   5,600    
Decrease in uncertain tax positions 3,500   3,500    
Minimum          
Operating Loss Carryforwards          
Anticipated decrease to unrecognized tax benefits 3,000        
Maximum          
Operating Loss Carryforwards          
Anticipated decrease to unrecognized tax benefits 7,000        
Domestic          
Operating Loss Carryforwards          
Operating loss carryforwards $ 357,300        
Operating loss carryforward, expiration date Dec. 31, 2025        
Operating loss carryforward not subject to expiration $ 115,400        
State          
Operating Loss Carryforwards          
Operating loss carryforwards $ 143,900        
Operating loss carryforward, expiration date Dec. 31, 2020        
Operating loss carryforward not subject to expiration $ 23,500        
NOL valuation allowance 200        
ASU 2016-09          
Operating Loss Carryforwards          
Deferred tax assets     600    
Valuation allowances     600    
Partnership Merger          
Operating Loss Carryforwards          
Deferred tax assets acquired       156,000  
Deferred Tax Asset          
Operating Loss Carryforwards          
Net deferred tax liability 2,800        
Other comprehensive income          
Operating Loss Carryforwards          
Tax cuts and jobs act, income tax expense (benefit)   (300)      
Continuing Operations          
Operating Loss Carryforwards          
Tax cuts and jobs act, income tax expense (benefit)   (57,700)      
Deferred tax assets       46,600  
Valuation allowances       45,200  
Discontinued Operations          
Operating Loss Carryforwards          
Tax cuts and jobs act, income tax expense (benefit)   4,600      
Deferred tax assets       5,600  
Valuation allowances       $ 5,600  
Unrecognized tax benefits that would impact tax rate if recognized $ 6,900 $ 6,400 $ 6,600