Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Share-Based Payments - Non-employee Director Non-vested Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Non-Employee Director Shares, Vesting Period (in years) 1 year  
Share-based compensation expense $ 1,962 $ 1,952
Nonemployee Director Nonvested Shares Granted Member    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
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 $ 44  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 44  
Outstanding and non-vested, aggregate grant date fair value $ 688  
Share-based compensation expense 169 171
Tax benefit related to share-based expense 63 64
Unrecognized share-based compensation, net of estimated forfeitures $ 77 $ 114
Weighted average period over which unrecognized compensation will be recognized (years) 1 month 11 days