Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Incentive Compensation Expense under Share-Based Payment Arrangements and Related Tax Benefit (Details) - USD ($) $ in Thousands |
3 Months Ended | |
---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Share-based compensation | $ 2,536 | $ 2,816 |
Tax benefit computed at the statutory rate | 888 | 986 |
Restricted Shares | ||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Share-based compensation | 87 | 93 |
Restricted Stock Units (RSUs) | ||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Share-based compensation | $ 2,449 | 2,817 |
Common Stock | ||
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
Share-based compensation | $ (94) |