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Share-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2014
Share-based Compensation [Abstract] |
Summary of Restricted Stock and Performance Unit Award Activity | The following table presents restricted stock and performance unit award activity for the nine months ended September 30, 2014:
| Restricted Stock |  | Performance Units
| Shares |  | Weighted Average Grant- Date Fair Value |  | Shares |  | Weighted Average Grant- Date Fair Value
Outstanding at December 31, 2013 | 1,463,694 |  |  | $ | 31.48 |  |  | 70,600 |  |  | $ | 47.83 |
Granted | 229,489 |  |  | 70.24 |  |  | 56,889 |  |  | 71.19 |
Vested | (475,050 | ) |  | 23.86 |  |  | — |  |  | — |
Forfeitures | (1,165 | ) |  | 62.74 |  |  | — |  |  | — |
Outstanding at September 30, 2014 | 1,216,968 |  |  | $ | 41.73 |  |  | 127,489 |  |  | $ | 58.25 |
Compensation Expense for Restricted Stock and Performance Units | Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures was as follows (dollars in thousands):
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2014 |  | 2013 |  | 2014 |  | 2013
Restricted stock | $ | (3,453 | ) |  | $ | (2,933 | ) |  | $ | (10,501 | ) |  | $ | (9,691 | )
Performance units | (594 | ) |  | (249 | ) |  | (1,147 | ) |  | (265 | )
Impact on income before income taxes | (4,047 | ) |  | (3,182 | ) |  | (11,648 | ) |  | (9,956 | )
Income tax benefit | 1,572 |  |  | 1,237 |  |  | 4,530 |  |  | 3,868 |
Impact on net income | $ | (2,475 | ) |  | $ | (1,945 | ) |  | $ | (7,118 | ) |  | $ | (6,088 | )
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at September 30, 2014, was as follows (dollars in thousands):
| September 30, 2014
| Unrecognized Compensation Expense |  | Remaining Weighted Average Recognition Period (in years)
Restricted stock | $ | 30,543 |  |  | 2.7
Performance units | 6,025 |  |  | 3.4
Total unrecognized share-based compensation expense | $ | 36,568 |  |  | 2.8

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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