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Share-Based Compensation and Cash-Based Incentive Compensation - Summary of Compensation Expense under Share-Based Payment Arrangements and Related Tax Benefit (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Share-based compensation | $ 3,754 | $ 3,507 | $ 11,398 | $ 8,457 |
| Tax benefit computed at the statutory rate | 1,314 | 1,227 | 3,989 | 2,960 |
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Restricted Stock
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Share-based compensation | 93 | 99 | 276 | 297 |
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Restricted Stock Units
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Share-based compensation | 3,658 | 3,408 | 9,819 | 8,160 |
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Common Shares
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||||
| Share-based compensation | $ 3 | $ 1,303 | ||