Stock-based Compensation (Stock-based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation [Abstract]
Stock-based compensation expense	$ 437	$ 411
2014	1,421
2015	1,715
2016	1,290
2017	1,144
2018	779
2019	90
Stock-based compensation expense that has yet to be recognized	$ 6,439

Future Share-based Compensation Expense, Remainder of Current Year

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- Definition

Future Share-based Compensation Expense, Year Five

+ References

No definition available.

+ Details

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- Definition

Future Share-based Compensation Expense, Year Four

+ References

No definition available.

+ Details

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- Definition

Future Share-based Compensation Expense, Year One

+ References

No definition available.

+ Details

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- Definition

Future Share-based Compensation Expense, Year Three

+ References

No definition available.

+ Details

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- Definition

Future Share-based Compensation Expense, Year Two

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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