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Leases (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Mar. 08, 2019
USD ($)
Jan. 01, 2019
USD ($)
Operating Leased Assets [Line Items]        
Net present value of operating lease aggrements $ 24,884      
Weighted average discount rate 5.50%      
Weighted average remaining lease term 6 years 2 months 12 days      
Deferred rent obligations $ 2,400      
Operating lease, option to terminate, period 29 years      
Operating lease, termination option, notice period requirement 2 years      
Right-of-use asset $ 22,961 $ 0    
Number of subleases | item 2      
Sublease income $ 228 $ 910    
Minimum [Member]        
Operating Leased Assets [Line Items]        
Lease terms 1 year      
Maximum [Member]        
Operating Leased Assets [Line Items]        
Lease terms 11 years      
Lease period of omitted leases 12 months      
On-X [Member]        
Operating Leased Assets [Line Items]        
Right-of-use asset     $ 3,700  
Discount rate     5.83%  
Accounting Standards Update 2016-02 [Member]        
Operating Leased Assets [Line Items]        
Net present value of operating lease aggrements       $ 22,700