Net Income per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Summary of Calculation of Net Income Per Share

The following table summarizes the calculation of net income (loss) per share attributable to common shareholders for the years ended December 31, 2018, 2017 and 2016:

Year ended December 31,	2018			2017			2016
Numerator:
Net income (loss)	$	(437,012	)	$	72,793		$	108,787
Less: income allocated to unvested restricted shares	—			(1,060		)	(1,147		)
Net income (loss)—basic	(437,012		)	71,733			107,640
Add: undistributed income attributable to unvested restricted shares—basic	—			58			297
Less: undistributed income attributable to unvested restricted shares—diluted	—			(58		)	(297		)
Net income (loss)—diluted	$	(437,012	)	$	71,733		$	107,640
Denominator:
Weighted average shares outstanding—basic and diluted	60,014			60,001			61,093
Net income (loss):
Basic and diluted	$	(7.28	)	$	1.20		$	1.76