Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Employee Activity Non-vested Shares (Details)

v3.7.0.1
Share-Based Payments - Employee Activity Non-vested Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 2,064 $ 2,159 $ 4,026 $ 4,111
Employee Non-vested Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants, vesting period (in years)     3 years  
Outstanding and non-vested, beginning of period (in shares) 242   222  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 0   126  
Shares Vested in Period (2)   (104)  
Shares Forfeited in Period (8)   (12)  
Outstanding and non-vested, end of period (in shares) 232   232  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 47   $ 45  
Grants in Period, Weighted Average Grant Date Fair Value 0   48  
Vested in Period, Weighed-average grant date fair value 43   45  
Forfeited in period (in dollars per share) 47   46  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 47   $ 47  
Outstanding and non-vested, aggregate grant date fair value $ 10,831   $ 10,831  
Share-based compensation expense 1,279 1,176 2,518 2,258
Tax benefit related to share-based expense 465 437 917 840
Unrecognized share-based compensation, net of estimated forfeitures $ 8,826 $ 8,470 $ 8,826 $ 8,470
Weighted average period over which unrecognized compensation will be recognized (years) 2 years 1 month 11 days   2 years 1 month 11 days