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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) - 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
Numerator for EPS:
Net income		$ 9,964	$ 26,882	$ 70,539	$ 85,756
Less: Preferred stock dividends		(3)	(3)	(8)	(8)
Income available to common stockholders		$ 9,961	$ 26,879	$ 70,531	$ 85,748
Denominator for EPS:
Weighted average common shares outstanding		34,686	35,042	34,927	34,878
Plus: Assumed conversion of share-based compensation	[1]	904	656	965	691
Assumed conversion of preferred stock		25	25	25	25
Weighted average diluted common shares outstanding		35,615	35,723	35,917	35,594
Basic earnings per common share		$ 0.29	$ 0.77	$ 2.02	$ 2.46
Diluted earnings per common share		$ 0.28	$ 0.75	$ 1.96	$ 2.41
[1] Represents the dilutive effect of unvested Restricted Stock, unvested Performance Share Units and unexercised Stock Options.

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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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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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