Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator (for basic and diluted earnings per share)
Net income	$ 8,545	$ 11,488	$ 6,606	$ 16,376
Less income allocated to RSUs	116	159	96	203
Numerator for basic and diluted earnings per share	$ 8,429	$ 11,329	$ 6,510	$ 16,173
Denominator
Basic weighted-average shares outstanding	82,302	83,773	82,191	83,869
Effect of dilutive securities:
Stock options held by employees and directors	163	278	198	315
Diluted weighted-average shares outstanding	82,465	84,051	82,389	84,184

Undistributed Earnings (Loss) Allocated to Participating Securities, Basic and Diluted

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

+ References

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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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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