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股票薪酬（限售股奖励及单位活动摘要）（详情） (限售股票〔成员〕, 美元$)
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12个月结束 | ||
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12月. 31, 2013
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12月. 31, 2012
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12月. 31, 2011
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限售股票〔成员〕
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| 以股份为基础的薪酬安排, 期权以外的权益工具, Nonvested, 股份数目[前滚] | |||
| 期初未授予限制性股份数（股） | 245,831 | 203,348 | 113,386 |
| 授予，未授予限制性股份数（股） | 463,952 | 196,832 | 153,332 |
| 已授予，未授予限制性股份数（股） | (237,646) | (135,015) | (63,370) |
| 被没收，未授予限制股份数目（股） | (8,500) | (19,334) | 0 |
| 期末未授予限制性股份数（股） | 463,637 | 245,831 | 203,348 |
| 以股份为基础的薪酬安排, 期权以外的权益工具, Nonvested, 加权平均授权日期公允价值[前滚] | |||
| 未授予限制性股份, 加权平均授予日期公允价值, 期初（每股美元） | $ 31.88 | $ 26.02 | $ 11.72 |
| 授予，加权平均授予日公允价值（每股美元） | $ 50.00 | $ 35.87 | $ 31.15 |
| 授予日加权平均公允价值（每股美元） | $ 41.79 | $ 29.59 | $ 12.87 |
| 被没收的加权平均授予日公允价值（每股美元） | $ 38.54 | $ 26.81 | $ 0.00 |
| Unvested Restricted stock, 加权平均授予日期公允价值, end of period (usd per share) | $ 44.80 | $ 31.88 | $ 26.02 |
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——定义
基于股权的支付工具的数量, 不包括股票（或单位）期权, 在本报告所述期间被没收. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——定义
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——定义
The number of grants made during the period on other than stock (or unit) option plans (for example, 幽灵库存或单位计划, 股票或单位升值权计划, 服务目标计划). 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——定义
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, 幽灵库存或单位计划, 股票或单位升值权计划, 服务目标计划). 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——定义
非既得股权支付工具的数量, 不包括股票（或单位）期权, 在资产负债表日有效存在并未结清的. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——细节
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——定义
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, 幽灵库存或单位计划, 股票或单位升值权计划, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——细节
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——定义
基于股权的支付工具的数量, 不包括股票（或单位）期权, 在本报告所述期间归属. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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——定义
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, 通过满足服务和性能要求, 获得或保留股份或单位, 其他乐器, 或按条款安排付现. 参考文献1:http://www.xbrl.org/2003/role/presentationRef
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