Note 21. Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Basic net (loss) income per share
Net (loss) income	$ (357,964)	$ 546,421	$ 395,964
Weighted-average common stock outstanding	102,866	100,886	100,048
Net (loss) income per share, basic	$ (3.48)	$ 5.42	$ 3.96
Denominator, diluted:
Weighted-average common stock outstanding	102,866	100,886	100,048
Effect of restricted and performance stock units and stock purchase plans	0	929	1,595
Weighted-average shares used in computing diluted net income (loss) per share	102,866	101,815	101,643
Net (loss) income per share, diluted	$ (3.48)	$ 5.37	$ 3.90
Anti-dilutive shares	753	48	70