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Secondary Offering (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 20, 2018
Dec. 31, 2018
Dec. 31, 2017
Class Of Stock [Line Items]      
Common stock, par value   $ 0.001 $ 0.001
Proceeds from issuance of common stock, net of issuance costs   $ 76,618  
Repayment of credit facility     $ 30,000
Shares issued in secondary offering, net of offering costs   $ 76,618  
Issuance costs $ 5,400    
Term Loan [Member] | Credit Facility [Member]      
Class Of Stock [Line Items]      
Repayment of credit facility $ 102,600    
Common Stock [Member]      
Class Of Stock [Line Items]      
Shares issued in secondary offering, net of offering costs, shares 2,100,000 1,390,000  
Common stock, par value $ 0.001    
Purchase price per share $ 59.00    
Shares issued in secondary offering, net of offering costs   $ 1  
Common Stock [Member] | Primary Shares [Member]      
Class Of Stock [Line Items]      
Shares issued in secondary offering, net of offering costs, shares 1,075,267    
Proceeds from issuance of common stock, net of issuance costs $ 59,100    
Common Stock [Member] | Secondary Shars [Member]      
Class Of Stock [Line Items]      
Shares issued in secondary offering, net of offering costs, shares 1,024,733    
Common Stock [Member] | Over-Allotment Option [Member]      
Class Of Stock [Line Items]      
Shares issued in secondary offering, net of offering costs, shares 315,000    
Proceeds from issuance of common stock, net of issuance costs $ 17,500    
Additional Paid-in Capital [Member]      
Class Of Stock [Line Items]      
Shares issued in secondary offering, net of offering costs $ 76,600 $ 76,617