Represents the maximum payout of shares granted upon the actual performance against the Performance Measures.

No definition available.

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- Definition

Represents the minimum payout of shares granted upon the actual performance against the Performance Measures.

+ References

No definition available.

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- Definition

Represents information pertaining to period over which the relative total shareholder return is to be calculated to enable vesting of share-based payment awards, 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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Estimated period over which an employee is required to provide service 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

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=96867065&loc=d3e5070-113901

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- 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=96867065&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=96867065&loc=d3e5070-113901

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- 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=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Value of forfeitures of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

+ 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=96867065&loc=d3e5070-113901

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- Definition

Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

+ References

No definition available.

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Stock-Based Compensation - RSAs and RSUs (Details) - USD ($) $ in Millions				1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 02, 2018	Jan. 17, 2017	Jan. 14, 2016	Feb. 28, 2018	Mar. 31, 2018	Dec. 31, 2011
Performance-Contingent RSAs and RSUs \| Long-term retention and incentive performance-contingent RSAs \| Senior Management \| Vested during year ended December 31, 2016
Stock-based compensation
Vested (in shares)						63,000
Timeframe for achievement of performance conditions						6 years
2016 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Vesting on February 20, 2018
Stock-based compensation
Vesting percentage				66.70%
2016 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Vesting on February 20, 2019
Stock-based compensation
Vesting percentage				33.30%
2016 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Timeframe for calculation of TSR			2 years
Minimum payout of shares (in shares)			0
Maximum payout of shares (in shares)			328,688
Aggregate value recognized as compensation expense			$ 2.0
Value of shares forfeited					$ 0.7
2016 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management \| Vesting on February 20, 2018
Stock-based compensation
Vesting percentage			66.70%
2016 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management \| Vesting on February 20, 2019
Stock-based compensation
Vesting percentage			33.30%
2016 Market-Based RSAs and RSUs \| Market-Based RSAs \| TSR and Performance Measures \| Vesting on February 20, 2018
Stock-based compensation
Granted (in shares)				69,440
2016 Market-Based RSAs and RSUs \| Market-Based RSAs \| TSR and Performance Measures \| Vesting on February 20, 2019
Stock-based compensation
Granted (in shares)				34,720
2016 Market-Based RSAs and RSUs \| Market-Based RSAs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Granted (in shares)			282,394	118,821
Forfeited (in shares)				59,411
2016 Market-Based RSAs and RSUs \| Market-Based RSUs \| TSR and Performance Measures \| Vesting on February 20, 2018
Stock-based compensation
Granted (in shares)				30,862
2016 Market-Based RSAs and RSUs \| Market-Based RSUs \| TSR and Performance Measures \| Vesting on February 20, 2019
Stock-based compensation
Granted (in shares)				15,432
2016 Market-Based RSAs and RSUs \| Market-Based RSUs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Granted (in shares)			46,294
2017 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Timeframe for calculation of TSR		2 years
Minimum payout of shares (in shares)		0
Maximum payout of shares (in shares)		406,868
Aggregate value recognized as compensation expense		$ 3.2
2017 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management \| Vesting on February 20, 2019
Stock-based compensation
Vesting percentage		66.70%
2017 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management \| Vesting on February 20, 2020
Stock-based compensation
Vesting percentage		33.30%
2017 Market-Based RSAs and RSUs \| Market-Based RSAs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Granted (in shares)		353,508
Forfeited (in shares)					233,448
Value of shares forfeited					$ 0.8
2017 Market-Based RSAs and RSUs \| Market-Based RSUs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Granted (in shares)		53,360
2018 Market-Based RSAs and RSUs \| Market-Based RSAs and RSUs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Timeframe for calculation of TSR	3 years
Minimum payout of shares (in shares)	0
Maximum payout of shares (in shares)	161,298
Aggregate value recognized as compensation expense	$ 1.7
2018 Market-Based RSAs and RSUs \| Market-Based RSAs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Granted (in shares)	111,668
2018 Market-Based RSAs and RSUs \| Market-Based RSUs \| TSR and Performance Measures \| Senior Management
Stock-based compensation
Granted (in shares)	49,630