Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Earnings Per Share

The calculation of basic and diluted EPS was as follows:

		Year ended December 31,
		2018			2017			2016
	(In thousands, except per-share amounts)
Basic EPS:
Numerator:
Net income		$	324,094		$	350,255		$	219,414
Income attributable to unvested participating securities			(1,893	)		(2,526	)		(1,835	)
Net income used in calculating basic EPS		$	322,201		$	347,729		$	217,579
Denominator:
Weighted-average vested shares			43,854			45,598			47,411
Basic EPS		$	7.35		$	7.63		$	4.59
Diluted EPS:
Numerator:
Net income		$	324,094		$	350,255		$	219,414
Income attributable to unvested participating securities			(1,888	)		(2,521	)		(1,833	)
Net income used in calculating diluted EPS		$	322,206		$	347,734		$	217,581
Denominator:
Weighted-average vested shares			43,854			45,598			47,411
Dilutive effect of incremental shares to be issued for    contingently-issuable shares			131			91			42
Weighted-average shares used in calculating diluted EPS			43,985			45,689			47,453
Diluted EPS		$	7.33		$	7.61		$	4.59