Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Share-Based Payments - Non-employee Director 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]        
Non-Employee Director Shares, Vesting Period (in years)     1 year  
Share-based compensation expense $ 2,159 $ 1,890 $ 4,111 $ 3,676
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) 15   15  
Grants in Period 16   16  
Shares Vested in Period (15)   (15)  
Outstanding and non-vested, end of period (in shares) 16   16  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 51   $ 51  
Grants in Period, Weighted Average Grant Date Fair Value 44   44  
Vested in Period, Weighed-average grant date fair value 51   51  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 44   $ 44  
Outstanding and non-vested, aggregate grant date fair value $ 688   $ 688  
Share-based compensation expense 211 156 382 316
Tax benefit related to share-based expense 65 60 135 122
Unrecognized share-based compensation, net of estimated forfeitures $ 592 $ 541 $ 592 $ 541
Weighted average period over which unrecognized compensation will be recognized (years) 10 months 11 days   10 months 11 days