Quarterly report pursuant to Section 13 or 15(d)

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

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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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 $ 1,890 $ 1,677 $ 3,676 $ 3,329
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 11   11  
Shares Vested in Period (14)   (14)  
Outstanding and non-vested, end of period (in shares) 12   12  
Outstanding and non-vested, weighted-average grant date fair value, beginning of period $ 44   $ 44  
Grants in Period, Weighted Average Grant Date Fair Value 52   52  
Vested in Period, Weighed-average grant date fair value 43   43  
Outstanding and non-vested, weighted-average grant date fair value, end of period $ 52   $ 52  
Outstanding and non-vested, aggregate grant date fair value $ 650   $ 650  
Share-based compensation expense 156 144 316 281
Tax benefit related to share-based expense 60 55 122 107
Unrecognized share-based compensation, net of estimated forfeitures $ 541 $ 515 $ 541 $ 515