Net Income per Common Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Summary of Calculation of Net Income Per Share

The following table summarizes the calculation of net income per share attributable to common shareholders for the years ended December 31, 2014, 2013, and 2012.

Year ended December 31,	2014			2013			2012
Numerator:
Net income	$	66,503		$	110,882		$	109,003
Less: income allocated to unvested restricted shares	(597		)	(738		)	(749		)
Net income attributable to common shareholders—basic	65,906			110,144			108,254
Add: undistributed income attributable to unvested restricted shares—basic	18			257			292
Less: undistributed income attributable to unvested restricted shares—diluted	(18		)	(257		)	(292		)
Net income attributable to common shareholders—diluted	$	65,906		$	110,144		$	108,254
Denominator:
Weighted average shares outstanding—basic	62,220			62,625			62,765
Dilutive shares—stock options	6			36			79
Weighted average shares outstanding—diluted	62,226			62,661			62,844
Net income attributable to common shareholders:
Basic	$	1.06		$	1.76		$	1.72
Diluted	$	1.06		$	1.76		$	1.72