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Share-Based Compensation (Details 4) (Incentive Unit Award, USD $)	12 Months Ended
	Dec. 31, 2013 trading_day	Dec. 31, 2012
Incentive Unit Award
Share-based Compensation
Vesting period	3 years
Award vesting percentage	33.33%
Number of shares considered for determining cash payment for each award upon vesting	1
Period for determination of cash payment value	10
Non-vested shares activity
Non-vested at the beginning of the period (in shares)	0
Granted (in shares)	251,431
Vested (in shares)	0
Forfeited (in shares)	0
Non-vested at the end of the period (in shares)	251,431
Weighted-Average Grant-Date Fair Value
Non-vested at the beginning of the period (in dollars per share)	$ 0.00
Granted (in dollars per share)	$ 22.62
Vested (in dollars per share)	$ 0.00
Forfeited (in dollars per share)	$ 0.00
Non-vested at the end of the period (in dollars per share)	$ 22.62
Aggregate Intrinsic Value	$ 5,700,000	$ 0
Unrecognized compensation cost	$ 5,700,000
Weighted-average period for amortization of unrecognized compensation cost	2 years

X

- Definition

Represents the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to non-vested equity-based payment instruments, excluding stock (or unit) options under the plan as of the balance sheet date.

+ References

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- Definition

Represents the number of shares considered for determining cash payment for each award upon vesting under equity based compensation arrangement.

+ References

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Share-based Compensation Arrangement by Share-based Payment Award, Period for Determination of Cash Payment Value

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-SubTopic 10

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

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, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, 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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

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, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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