Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income (loss) attributable to common shareholders	$ 39,488	$ 69,949	$ 49,499	$ 76,515
Less: dividends paid on unvested share-based compensation	(104)	(120)	(207)	(241)
Undistributed earnings attributable to share-based compensation	(52)	(185)	0	(92)
Net income (loss) available to common shareholders	$ 39,332	$ 69,644	$ 49,292	$ 76,182
Denominator:
Weighted-average number of common shares-basic	69,168,788	71,922,904	70,383,149	71,879,859
Effect of dilutive share-based compensation	299,566	396,880	323,653	493,517
Weighted-average number of common shares-diluted	69,468,354	72,319,784	70,706,802	72,373,376
Net income (loss) per share available to common shareholders, basic (in usd per share)	$ 0.57	$ 0.97	$ 0.70	$ 1.06
Net income (loss) per share available to common shareholders, diluted (in usd per share)	$ 0.57	$ 0.96	$ 0.70	$ 1.05
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	17,758	117,201	18,394	117,201

Net income loss available to common stockholders basic and diluted.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units.

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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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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.

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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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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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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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