Earnings Per Share Attributable to Stockholders (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017	stockholders	of shares		amount
Basic	75,027	107,044,348	$	0.70
Effect of dilutive securities:
PSUs	(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:
PSUs	-	91,997		-
Stock options	-	735,474		(0.01)
Diluted	91,832	107,457,794	$	0.85

	Net income	WA
	attributable to	number		Per share
Year ended December 31, 2015	stockholders	of shares		amount
Basic	136,214	107,075,845	$	1.27
Effect of dilutive securities:
Stock options	-	356,629		-
Diluted	136,214	107,432,474	$	1.27