Stock Compensation - Restricted Stock and Performance Share Grants - Performance Share Grants (Details) - Performance share grants	12 Months Ended
Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Below threshold performance	0
Threshold performance	169,178
Target performance	387,886
Maximum performance	589,415

Performance Awards Granted with Performance Conditions, Number of Shares to be Issued, Below Threshold Performance

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- Definition

Performance Awards Granted with Performance Conditions, Maximum Number of Shares to be Issued, at Maximum Performance

+ References

No definition available.

+ Details

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- Definition

Performance Awards Granted with Performance Conditions, Minimum Number of Shares to be Issued, at Threshold Performance

+ References

No definition available.

+ Details

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- Definition

Performance Awards Granted with Performance Conditions, Number of Shares to be Issued, at Target Performance

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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