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Represents the percentage vested immediately when performance requirements have been earned.

+ References

No definition available.

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- Definition

Represents the awards earned expressed as a percentage of specified compensation.

+ References

No definition available.

+ Details

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- Definition

Represents a one-year period relating to the performance-based program.

+ References

No definition available.

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- Definition

Represents the exercise of options as a percentage of fair value of the company's common stock on the date of grant.

+ References

No definition available.

+ Details

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Estimated period over which the entity is being measured for performance in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Represents the eligible age of retirement after which the awards granted to employees will vest.

+ References

No definition available.

+ Details

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- Definition

Represents the factor used for granting of stock options and stock appreciation rights against the share limit of the awards that are not full value awards.

+ References

No definition available.

+ Details

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- Definition

Represents the factor used for granting of RSUs, DSUs, restricted and unrestricted stock awards and performance awards against the share limit of the awards that are full value awards.

+ References

No definition available.

+ Details

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- Definition

Number of shares under the share-based compensation performance-based program of the entity that have been earned.

+ References

No definition available.

+ Details

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- Definition

Number of shares issued or to be issued under the share-based compensation performance-based program of the entity.

+ References

No definition available.

+ Details

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- Definition

Represents a two-year period relating to the performance-based program.

+ References

No definition available.

+ Details

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- Definition

Represents the total number of shares that may be issued if all performance based awards that have been granted, are earned (based on performance by the entity) at the full 100% level.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

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.

+ 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 (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

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

+ 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)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Period Type:	duration

- 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.

+ 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)(iii)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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).

+ 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)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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).

+ 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)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ 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)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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.

+ 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)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Period Type:	duration

- Definition

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

+ 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)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ 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)(iii)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Data Type:	num:perShareItemType
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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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Equity-based Incentive Plans (Details) (USD $)	12 Months Ended			0 Months Ended
Equity-based Incentive Plans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 17, 2012
Deferred Stock Units
Long term incentive compensation program
Granted (in shares)	54,000	53,000	79,000
Number of RSU's
Granted (in shares)	54,000	53,000	79,000
2006 Amended and Restated Equity Incentive Plan (2006 Plan)
Equity-based Incentive Plans
Additional number of shares authorized for issuance				15,500,000
Factor used for granting of stock options and stock appreciation rights against the share limit of the awards that are not full value awards (in shares)	1
Factor used for granting of RSUs, DSUs, restricted and unrestricted stock awards and performance awards against the share limit of the awards that are full value awards (in shares)	2.09
Shares available for issuance	9,600,000
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Restricted Stock Units (RSUs)
Equity-based Incentive Plans
Vesting percentage	100.00%
Eligible age for retirement	59 years 6 months
Long term incentive compensation program
Granted (in shares)	1,121,416	1,293,140	1,422,448
Number of RSU's
Outstanding at the beginning of the period (in shares)	2,279,643	1,269,307
Granted (in shares)	1,121,416	1,293,140	1,422,448
Vested (in shares)	(1,245,489)	(170,398)	(143,666)
Forfeited (in shares)	(144,344)	(112,406)	(9,475)
Outstanding at the end of the period (in dollars per share)	2,011,226	2,279,643	1,269,307
Weighted Average Grant Date Fair Value
Outstanding, at the beginning of the period (in dollars per share)	14.97	11.87
Granted (in dollars per share)	21.82	18.16	11.95
Vested (in dollars per share)	13.20	17.74	12.65
Forfeited (in dollars per share)	15.51	12.48	11.92
Outstanding, at the end of the period (in dollars per share)	19.85	14.97	11.87
Aggregate Intrinsic Value
Aggregate Intrinsic Value	39,702,000	44,544,000	17,428,000
Unrecognized Compensation
Unrecognized Compensation	25,171,000	22,197,000	12,318,000
Weighted average remaining life before vesting of the outstanding RSU's	1 year 4 months 24 days
Fair value of vesting during the period	24,600,000	3,300,000
Number of withheld shares	444,000	63,000	49,000
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Employee Stock Option
Equity-based Incentive Plans
Vesting percentage	100.00%
Vesting period	6 months
Term of award	5 years
Options exercise price as a percentage of fair value of common stock	100.00%
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Performance Shares \| Senior Executive Officers
Equity-based Incentive Plans
Performance period	3 years
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Performance Shares \| Senior Executive Officers \| Minimum
Equity-based Incentive Plans
Awards earned as percentage of specified compensation	0.00%
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Performance Shares \| Senior Executive Officers \| Maximum
Equity-based Incentive Plans
Awards earned as percentage of specified compensation	100.00%
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Performance Shares \| Vesting Based On Performance \| Senior Executive Officers
Equity-based Incentive Plans
Percentage of shares that vest immediately when performance earned	33.30%
Performance period one	1 year
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Performance Shares \| Vesting Based On Service \| Senior Executive Officers
Equity-based Incentive Plans
Vesting period	2 years
Performance period two	2 years
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2012 Award \| Senior Executive Officers
Long term incentive compensation program
Maximum Shares That Could Be Issued	164,291
Award Earned	95,291
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2012 Award \| Performance/Service period one \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	31,764
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2012 Award \| Performance/Service period two \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	31,764
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2012 Award \| Performance/Service period three \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	31,763
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2013 Award \| Senior Executive Officers
Long term incentive compensation program
Maximum Shares That Could Be Issued	173,319
Award Earned	164,653
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2013 Award \| Performance/Service period one \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	54,885
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2013 Award \| Performance/Service period two \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	54,884
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| One-year performance period transition award \| 2013 Award \| Performance/Service period three \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	54,884
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Two-year performance period transition award \| 2013 Award \| Senior Executive Officers
Long term incentive compensation program
Maximum Shares That Could Be Issued	173,319
Award Earned	159,454
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Two-year performance period transition award \| 2013 Award \| Performance/Service period one \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	53,152
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Two-year performance period transition award \| 2013 Award \| Performance/Service period two \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	53,151
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Two-year performance period transition award \| 2013 Award \| Performance/Service period three \| Senior Executive Officers
Long term incentive compensation program
Awards Issued/Issuable	53,151
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Three-year performance period award \| 2013 Award \| Senior Executive Officers
Long term incentive compensation program
Maximum Shares That Could Be Issued	173,319
2006 Amended and Restated Equity Incentive Plan (2006 Plan) \| Three-year performance period award \| 2014 Award \| Senior Executive Officers
Long term incentive compensation program
Maximum Shares That Could Be Issued	269,351