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Equity-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Employee Equity-Based Compensation Expense | Employee equity-based compensation expense was recognized as follows:
(In thousands) |  | 2013 |  | 2012 |  | 2011
Restricted stock units |  | $ | 1,801 |  |  | $ | 970 |  |  | $ | 1,212 |
Performance shares |  | 5,075 |  |  | 7,364 |  |  | 5,446 |
Total employee equity-based compensation |  | $ | 6,876 |  |  | $ | 8,334 |  |  | $ | 6,658 |
Related tax benefit |  | $ | 2,049 |  |  | $ | 2,886 |  |  | $ | 2,290 |
Summary of Status of Outstanding RSU Awards | A summary of the status of outstanding unvested RSU awards as of December 31, 2013, 2012 and 2011, and changes during those years, is presented below:
|  | 2013 |  | 2012 |  | 2011
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Unvested shares outstanding at |  |  |  |  |  |  |  |  |  |  |  |
January 1 |  | 63,727 |  |  | $ | 35.57 |  |  | 169,344 |  |  | $ | 11.33 |  |  | 437,272 |  |  | $ | 6.96 |
Granted |  | 72,702 |  |  | 43.44 |  |  | 52,294 |  |  | 34.59 |  |  | 23,138 |  |  | 38.42 |
Vested |  | (30,190 | ) |  | 39.21 |  |  | (155,177 | ) |  | 8.82 |  |  | (286,486 | ) |  | 6.88 |
Forfeited |  | (3,581 | ) |  | 42.03 |  |  | (2,734 | ) |  | 34.07 |  |  | (4,580 | ) |  | 8.64 |
Unvested shares outstanding at December 31 |  | 102,658 |  |  | 39.85 |  |  | 63,727 |  |  | 35.57 |  |  | 169,344 |  |  | 11.33 |
Aggregate intrinsic value (in thousands) |  |  |  | $ | 5,390 |  |  |  |  | $ | 2,496 |  |  |  |  | $ | 6,030 |
Assumption Used in Monte Carlo Model to Estimate Fair Value of Performance Shares Awards | The fair value of performance share awards is estimated using a Monte Carlo simulation model. For performance shares granted in 2013, the following assumptions were used in our Monte Carlo model:
Closing price of stock on date of grant | $ | 47.30 |
Risk free rate | 0.35 | %
Measurement period | 3 years |
Volatility | 30 | %
Summary of Status of Outstanding Performance Share Awards | A summary of the status of outstanding performance share awards as of December 31, 2013, 2012 and 2011, and changes during those years, is presented below:
|  | 2013 |  | 2012 |  | 2011
|  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding share awards at January 1 |  | 392,655 |  |  | $ | 44.67 |  |  | 749,538 |  |  | $ | 19.52 |  |  | 638,870 |  |  | $ | 13.00 |
Granted |  | 124,513 |  |  | 63.46 |  |  | 150,865 |  |  | 40.24 |  |  | 110,668 |  |  | 57.18 |
Settled |  | (246,592 | ) |  | 47.19 |  |  | (499,680 | ) |  | 5.65 |  |  | — |  |  | — |
Forfeited |  | (10,735 | ) |  | 54.87 |  |  | (8,068 | ) |  | 42.15 |  |  | — |  |  | — |
Outstanding share awards at December 31 |  | 259,841 |  |  | 50.87 |  |  | 392,655 |  |  | 44.67 |  |  | 749,538 |  |  | 19.52 |
Aggregate intrinsic value (in thousands) |  |  |  | $ | 13,642 |  |  |  |  | $ | 15,376 |  |  |  |  | $ | 26,691 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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 restricted stock units. + 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 significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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