Share-Based Compensation - Summary of Liability Based Award Activity (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock (RSU)
Summary of Liability-Based Award Activity [Roll Forward]
Granted, Weighted-Average Grant Date Fair Value	$ 24.87
Liability Based Awards \| Performance unit incentive plan (PUP)
Summary of Liability-Based Award Activity [Roll Forward]
Beginning Balance, Shares	299,768	210,600	95,500
Granted, Shares	123,300	93,100	115,100
Vested, Shares	(94,600)	0	0
Forfeited or Cancelled, Shares	(61,348)	(3,932)	0
Ending Balance, Shares	267,120	299,768	210,600
Beginning Balance, Weighted-Average Grant Date Fair Value	$ 23.46	$ 21.70	$ 23.02
Granted, Weighted-Average Grant Date Fair Value	$ 23.71	$ 27.35	$ 20.60
Vested, Weighted-Average Grant Date Fair Value	$ 23.01	$ 0.00	$ 0.00
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value	$ 24.43	$ 21.15	$ 0.00
Ending Balance, Weighted-Average Grant Date Fair Value	$ 23.51	$ 23.46	$ 21.70
Liability Based Awards \| Restricted Stock (RSU)
Summary of Liability-Based Award Activity [Roll Forward]
Beginning Balance, Shares	28,560	40,500	38,600
Granted, Shares	7,200	8,600	15,850
Vested, Shares	(9,890)	(11,300)	(13,100)
Forfeited or Cancelled, Shares	(500)	(9,240)	(850)
Ending Balance, Shares	25,370	28,560	40,500
Beginning Balance, Weighted-Average Grant Date Fair Value	$ 22.91	$ 20.82	$ 19.07
Granted, Weighted-Average Grant Date Fair Value		$ 27.35	$ 20.57
Vested, Weighted-Average Grant Date Fair Value	$ 23.45	$ 19.10	$ 15.36
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value	$ 27.32	$ 22.55	$ 20.89
Ending Balance, Weighted-Average Grant Date Fair Value	$ 23.17	$ 22.91	$ 20.82
Liability Based Awards \| Performance Based Restricted Stock Shares (PBRSU)
Summary of Liability-Based Award Activity [Roll Forward]
Beginning Balance, Shares	0	0	1,956
Granted, Shares	0	0	0
Vested, Shares	0	0	(1,956)
Forfeited or Cancelled, Shares	0	0	0
Ending Balance, Shares	0	0	0
Beginning Balance, Weighted-Average Grant Date Fair Value	$ 0.00		$ 15.36
Granted, Weighted-Average Grant Date Fair Value	$ 0.00	$ 0.00	$ 0.00
Vested, Weighted-Average Grant Date Fair Value	$ 0.00	$ 0.00	$ 15.36
Forfeited or Cancelled, Weighted-Average Grant Date Fair Value	$ 0.00	$ 0.00	$ 0.00
Ending Balance, Weighted-Average Grant Date Fair Value	$ 0.00	$ 0.00

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

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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- 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

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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- 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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