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Share-Based Compensation And Other Related Information - Restricted Stock Unit Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation $ 2,957 $ 3,077
Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation $ 1,700 $ 2,000
Other equity instruments outstanding. beginning (shares | shares 262,013 315,423
Granted (shares) | shares 244,961 184,187
Paid out (shares) | shares (156,715) (222,006)
Forfeited (shares) | shares (21,436) (15,591)
Other equity instruments outstanding, ending (shares) | shares 328,823 262,013
Fair value of other equity instruments outstanding, beginning $ 4,098 $ 4,764
Granted, fair value 3,207 2,698
Paid out, fair value (2,181) (3,257)
Forfeited, fair value (313) (243)
Change in value, fair value (1,187) 136
Fair value of other equity instruments outstanding, ending $ 3,624 $ 4,098
First Anniversary of Grant [member] | Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Award vesting (percent) 33.30%  
Second Anniversary of Grant [member] | Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Award vesting (percent) 33.30%  
Third Anniversary of Grant [member] | Restricted Share Units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Award vesting (percent) 33.30%