Employee Stock Benefit Plans (Nonvested Stock Option Activity) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period	342,276	347,591	422,757
Granted	233,054	203,825	163,042
Vested	(113,550)	(201,865)	(202,115)
Forfeited	(23,265)	(7,275)	(36,093)
Nonvested at end of period	438,515	342,276	347,591
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at beginning of period, weighted-average value (in USD per share)	$ 9.07	$ 9.11	$ 7.53
Granted, weighted-average value (in USD per share)	$ 10.86	$ 8.42	$ 9.33
Vested, weighted-average value (in USD per share)	$ 9.37	$ 8.47	$ 5.76
Forfeited, weighted-average value (in USD per share)	$ 9.73	$ 9.78	$ 10.40
Nonvested at end of period, weighted-average value (in USD per share)	$ 9.91	$ 9.07	$ 9.11

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Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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)(1)

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

+ Details

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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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- Definition

Number of non-vested options forfeited.

+ References

No definition available.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

+ References

No definition available.

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

+ Details

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- Definition

Number of options vested.

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No definition available.

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- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

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