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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net Income (Loss)	$ 4,511	$ 182,033	$ 10,265	$ 198,396
Denominator:
Weighted-average common shares outstanding, Basic (in shares)	110,214	116,444	109,951	115,940
Effect of potential dilutive common shares	3,509	3,098	2,854	3,057
Denominator:
Weighted-average common shares outstanding, Diluted (in shares)	113,723	119,542	112,805	118,997
Earnings Per Share, Basic	$ 0.04	$ 1.56	$ 0.09	$ 1.71
Earnings Per Share, Diluted	$ 0.04	$ 1.52	$ 0.09	$ 1.67

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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