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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 2,159 $ 1,890 $ 4,111 $ 3,676
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) 222   191  
Stock Issued During Period, Shares, Restricted Stock Award, Gross 9   134  
Shares Vested in Period (1)   (93)  
Shares Forfeited in Period (2)   (4)  
Outstanding and non-vested, end of period (in shares) 228   228  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 46   $ 46  
Grants in Period, Weighted Average Grant Date Fair Value 43   44  
Vested in Period, Weighed-average grant date fair value 37   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 $ 10,363   $ 10,363  
Share-based compensation expense 1,176 1,022 2,258 2,010
Tax benefit related to share-based expense 437 393 840 772
Unrecognized share-based compensation, net of estimated forfeitures $ 8,470 $ 7,231 $ 8,470 $ 7,231
Weighted average period over which unrecognized compensation will be recognized (years) 2 years 1 month 11 days   2 years 1 month 11 days