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Stockholders' Equity - Additional Information (Details)
 12 Months Ended
Feb. 12, 2019
$ / shares
shares
Oct. 26, 2018
USD ($)
shares
Apr. 12, 2018
USD ($)
$ / shares
shares
Aug. 02, 2017
shares
Aug. 01, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Dec. 31, 2012
$ / shares
shares
Oct. 29, 2018
USD ($)
Class Of Stock [Line Items]                    
Stock issued during period shares     5,405,000   2,530,000          
Shares issued price per share | $ / shares     $ 37.50   $ 27.50          
Gross proceeds from issuance of common stock | $     $ 202,688,000   $ 69,575,000          
Net proceeds after underwriting discounts and offering expenses | $     $ 192,053,000   $ 65,509,000 $ 192,053,000 $ 65,509,000      
Number of shares repurchased under stock repurchase program           0        
Exercise price of warrants, per share | $ / shares                 $ 11.58  
Warrant expiration date                 Dec. 12, 2022  
Stock issued during period shares warrants excercised       153,134            
Series A Preferred Stock                    
Class Of Stock [Line Items]                    
Dividend rate           Prime + 2% Prime + 2%      
Dividend rate           8.00% 8.00%      
Company's redemption rights modified date           Oct. 15, 2018        
Number of preferred stock converted   45,500         0 0    
Preferred stock converted to common stock | $   $ 4,550,000                
Preferred stock converted to common stock (in shares)   315,773                
Conversion ratio - preferred to common   6.94008                
Series B Preferred Stock                    
Class Of Stock [Line Items]                    
Dividend rate           8.00% 8.00%      
Company's redemption rights modified date           Oct. 15, 2018        
Number of preferred stock converted   51,076         880 0    
Preferred stock converted to common stock | $   $ 5,108,000         $ 88,000      
Preferred stock converted to common stock (in shares)   354,463         6,106      
Conversion ratio - preferred to common   6.94008                
Warrant                    
Class Of Stock [Line Items]                    
Warrants issued to Triumph Consolidated Cos LLC                 259,067  
Subsequent Event                    
Class Of Stock [Line Items]                    
Shares repurchased and held into treasury stock 247,312                  
Shares repurchased, average price per share | $ / shares $ 30.51                  
Maximum                    
Class Of Stock [Line Items]                    
Amount authorized under stock repurchase program | $                   $ 25,000,000
Over-Allotment Option                    
Class Of Stock [Line Items]                    
Stock issued during period shares     705,000   330,000