Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Share-Based Payments - Employee Activity Non-vested Shares (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 2,093 $ 1,886 $ 6,204 $ 5,562
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) 228   191  
Stock Issued During Period, Shares, Restricted Stock Award, Gross     134  
Shares Vested in Period (1)   (94)  
Shares Forfeited in Period (3)   (7)  
Outstanding and non-vested, end of period (in shares) 224   224  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 45   $ 46  
Grants in Period, Weighted Average Grant Date Fair Value     44  
Vested in Period, Weighed-average grant date fair value 47   44  
Forfeited in period (in dollars per share) 45   46  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 45   $ 45  
Outstanding and non-vested, aggregate grant date fair value $ 10,173   $ 10,173  
Share-based compensation expense 1,176 1,031 3,434 3,042
Tax benefit related to share-based expense 434 403 1,270 1,190
Unrecognized share-based compensation, net of estimated forfeitures $ 7,147 $ 6,148 $ 7,147 $ 6,148
Weighted average period over which unrecognized compensation will be recognized (years) 2 years 11 days   2 years 11 days