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Basis of Presentation and Summary of Significant Accounting Policies Correction of Immaterial Error (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Liabilities $ 696,010 $ 723,877    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (221,492) $ (197,656) $ (175,734) $ (155,339)
Out-of-period Immaterial Adjustment [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Increase (Decrease) in Deferred Income Taxes 2,255      
Liabilities 2,255      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (2,255)      
Increase in Deferred tax liability   7.80%    
Increase in Total liabilities   0.30%    
Decrease in Retained earnings   3.70%    
Decrease in Total stockholders' equity   1.10%    
Accumulated Deficit        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (71,680) $ (57,904) $ (20,711) $ (1,130)
Accumulated Deficit | Out-of-period Immaterial Adjustment [Member]        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (2,255)