Stock Compensation Plans - Summary of Nonvested Stock Compensation Awards (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of nonvested stock compensation awards [Rollforward]
Number of Shares outstanding, Beginning balance (in shares)	734,612	660,059	635,726
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share)	$ 11.55	$ 9.80	$ 7.87
Number of Nonvested shares outstanding, Granted (in shares)	268,300	417,420	379,425
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	$ 12.25	$ 12.36	$ 11.42
Number of Nonvested shares outstanding, Vested (in shares)	(360,832)	(317,635)	(311,630)
Weighted Average grant Date Fair Value, Vested (in dollars per share)	$ 11.00	$ 8.99	$ 7.80
Number of Nonvested shares outstanding, Forfeited (in shares)	(18,015)	(25,232)	(43,462)
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	$ 12.09	$ 11.59	$ 9.77
Number of Nonvested shares outstanding, Ending balance (in shares)	624,065	734,612	660,059
Weighted Average Grant date Fair Value, Ending balance (in dollars per share)	$ 12.15	$ 11.55	$ 9.80
2010 Long-Term Incentive Plan [Member]
Summary of nonvested stock compensation awards [Rollforward]
Number of Shares outstanding, Beginning balance (in shares)	49,997	75,000	0
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share)	$ 30.66	$ 30.66	$ 0
Number of Nonvested shares outstanding, Granted (in shares)	129,700	0	77,000
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	$ 28.94	$ 0	$ 30.66
Number of Nonvested shares outstanding, Vested (in shares)	(34,998)	(25,003)	0
Weighted Average grant Date Fair Value, Vested (in dollars per share)	$ 30.56	$ 30.66	$ 0
Number of Nonvested shares outstanding, Forfeited (in shares)	(1,700)		(2,000)
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	$ 28.95	$ 0	$ 30.66
Number of Nonvested shares outstanding, Ending balance (in shares)	142,999	49,997	75,000
Weighted Average Grant date Fair Value, Ending balance (in dollars per share)	$ 29.15	$ 30.66	$ 30.66

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.

+ References

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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).

+ References

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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

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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

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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

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-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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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