Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Non-employee Director Non-vested Shares (Details)

v3.20.1
Share-Based Payments - Non-employee Director Non-vested Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended
May 31, 2016
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense   $ 3,266 $ 3,047
Nonemployee Director Nonvested Shares Granted Member      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Additional Shares Authorized 160    
Number of Shares Authorized   360  
Number of Shares Available for Grant   116  
Outstanding and non-vested, beginning of period (in shares)   16  
Outstanding and non-vested, end of period (in shares)   16  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period   $ 62  
Outstanding and non-vested, weighted-average grant date fair value, end of period   $ 62  
Outstanding and non-vested, aggregate grant date fair value   $ 990  
Share-based compensation expense   261 218
Tax benefit related to share-based expense   60 52
Unrecognized share-based compensation, net of estimated forfeitures   $ 106 $ 142
Weighted average period over which unrecognized compensation will be recognized (years)   1 month 6 days