Earnings Per Share - Participating Securities (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic EPS:
Basic EPS	$ 0.62	$ 0.38	$ 1.20	$ 0.87
Diluted EPS:
Diluted EPS	$ 0.62	$ 0.38	$ 1.19	$ 0.87
Participating Securities
Basic EPS:
Net income allocated to nonvested awards	$ 252	$ 347	$ 631	$ 850
Average common shares outstanding	412	934	536	989
Basic EPS	$ 0.61	$ 0.37	$ 1.18	$ 0.86
Diluted EPS:
Net income allocated to nonvested awards(c)	$ 250	$ 346	$ 628	$ 847
Average common and common equivalent shares outstanding(d)	412	934	536	989
Diluted EPS	$ 0.61	$ 0.37	$ 1.17	$ 0.86

Income Loss From Continuing Operations Allocable To Non Vested Restricted Shares Basic

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Income Loss From Continuing Operations Allocable To Non Vested Restricted Shares Diluted

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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