Earnings Per Share Attributable to Stockholders (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share Attributable to Stockholders [Abstract]

Computation of Basic and Diluted Earnings Per Share

		Net income	WA
		attributable to	number		Per share
Year ended December 31, 2018		stockholders	of shares		amount
Basic	$	121,479	108,063,349	$	1.12
Effect of dilutive securities:
Share units		-	459,503		-
Stock options		-	865,384		(0.01)
Diluted	$	121,479	109,388,236	$	1.11

		Net income	WA
		attributable to	number		Per share
Year ended December 31, 2017		stockholders	of shares		amount
Basic	$	75,027	107,044,348	$	0.70
Effect of dilutive securities:
Share units		(152)	353,880		-
Stock options		-	714,923		(0.01)
Diluted	$	74,875	108,113,151	$	0.69

		Net income	WA
		attributable to	number		Per share
Year ended December 31, 2016		stockholders	of shares		amount
Basic	$	91,832	106,630,323	$	0.86
Effect of dilutive securities:
Share units			91,997		-
Stock options		-	735,474		(0.01)
Diluted	$	91,832	107,457,794	$	0.85