Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income to common shareholders	$ 58,902	$ 46,719	$ 160,183	$ 97,465
Net income allocated to participating securities - basic and diluted	1,244	1,101	3,566	2,334
Net income allocated to common shareholders - basic and diluted	$ 57,658	$ 45,618	$ 156,617	$ 95,131
Weighted-average common shares - basic	84,749	77,550	84,577	77,525
Dilutive potential common shares	231	127	241	128
Weighted-average common shares - diluted	84,980	77,677	84,818	77,653
Earnings per common share: Basic	$ 0.68	$ 0.59	$ 1.85	$ 1.23
Earnings per common share: Diluted	$ 0.68	$ 0.59	$ 1.85	$ 1.23

Net income loss allocated to common shareholders basic and diluted.

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Earnings allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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