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Stock-Based Compensation and Similar Arrangements - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Feb. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options outstanding (in shares)   809,396    
Weighted-average exercise price (in usd per share)   $ 62.14    
Stock equivalent units outstanding (in shares)   4,234    
Stock option equivalent units outstanding (in shares)   200,000    
Stock-based compensation   $ 2,103 $ 987  
Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fixed payment   12,000    
Deferred compensation liability   1,846   $ 1,441
General and administrative expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation   $ 2,103 927  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of unvested RSAs outstanding (in shares)   59,101    
Weighted-average grant date fair value of unvested RSAs outstanding (in usd per share)   $ 62.28    
Restricted Stock | Interim CEO        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 23,317      
Grant date intrinsic value $ 1,500      
Stock Equivalent Unit Awards and Stock Option Equivalent Units | Accrued Expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Liability for unexercised cash settled share-based payment awards   $ 4,717   $ 3,719
Stock Equivalent Unit Awards and Stock Option Equivalent Units | General and administrative expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense (benefit)   $ 1,189 $ 1,832