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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 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 six months ended June 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 | (470,374 | ) |  | 23.77 |  |  | — |  |  | — |
Forfeitures | (225 | ) |  | 27.44 |  |  | — |  |  | — |
Outstanding at June 30, 2014 | 1,222,584 |  |  | $ | 41.72 |  |  | 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 June 30 |  | Six Months Ended June 30
| 2014 |  | 2013 |  | 2014 |  | 2013
Restricted stock | $ | (3,727 | ) |  | $ | (3,121 | ) |  | $ | (7,048 | ) |  | $ | (6,758 | )
Performance units | (286 | ) |  | (16 | ) |  | (553 | ) |  | (16 | )
Impact on income before income taxes | (4,013 | ) |  | (3,137 | ) |  | (7,601 | ) |  | (6,774 | )
Income tax benefit | 1,562 |  |  | 1,219 |  |  | 2,958 |  |  | 2,631 |
Impact on net income | $ | (2,451 | ) |  | $ | (1,918 | ) |  | $ | (4,643 | ) |  | $ | (4,143 | )
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at June 30, 2014, is as follows (dollars in thousands):
| June 30, 2014
| Unrecognized Compensation Expense |  | Remaining Weighted Average Recognition Period (in years)
Restricted stock | $ | 33,901 |  |  | 2.9
Performance units | 6,546 |  |  | 3.6
Total unrecognized share-based compensation expense | $ | 40,447 |  |  | 3.0

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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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