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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Stock Awards Excluded from the Calculation of Diluted EPS



	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Stock awards subject to performance conditions		108			247			100			244
Stock awards that were antidilutive		2,061			1,506			2,144			1,482
Total stock awards excluded from diluted earnings per share		2,169			1,753			2,244			1,726

Basic and Diluted Earnings Per Share



	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Net income	$	46,884		$	66,730		$	106,330		$	112,850
Shares:
Weighted-average number of common shares outstanding		27,819			28,649			27,865			28,699
Dilutive stock awards		116			151			77			126
Diluted weighted-average number of common shares outstanding		27,935			28,800			27,942			28,825
Basic earnings per share	$	1.69		$	2.33		$	3.82		$	3.93
Diluted earnings per share	$	1.68		$	2.32		$	3.81		$	3.92