Stock-Based Compensation (Details 2) - shares	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Restricted stock awards
Stock-based compensation
Vesting period of shares awarded under the Program	3 years
Performance share awards
Stock-based compensation
Vesting period of shares awarded under the Program	3 years
Deferred Compensation Equity
Performance share awards
Number of common stock deferred (in shares)	237,261	228,047

Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (l)

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- Definition

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+ 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=6415400&loc=d3e5070-113901

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- Definition

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