Stock-Based Compensation - Vesting and Deferred Compensation Plan (Details 2) - shares	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
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)	276,115	253,520

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

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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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