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Aggregate dividends declared during the period for each share of common stock outstanding.

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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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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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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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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Unaudited Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unaudited Quarterly Data [Line Items]
Total revenues									$ 2,963,252	$ 3,278,420	$ 3,157,796
Gross Profit									1,935,049	2,118,109	2,184,363
Operating (loss) profit									(66,596)	(1,007,888)	193,462
Net (loss) earnings									$ (105,195)	$ (953,520)	$ 96,422
Basic (loss) earnings per common share									$ (1.98)	$ (17.97)	$ 1.82
Diluted (loss) earnings per common share									(1.98)	(17.97)	1.81
Cash dividends declared per common share									$ 0.32	$ 0.96	$ 0.93
First Quarter [Member]
Unaudited Quarterly Data [Line Items]
Total revenues				$ 835,652				$ 877,639
Gross Profit				534,944				564,593
Operating (loss) profit				48,430				56,598
Net (loss) earnings				$ 25,061				$ 27,298
Basic (loss) earnings per common share				$ 0.47				$ 0.51
Diluted (loss) earnings per common share				0.47				0.51
Cash dividends declared per common share				$ 0.08				$ 0.24
Second Quarter [Member]
Unaudited Quarterly Data [Line Items]
Total revenues			$ 749,619				$ 815,343
Gross Profit			500,158				538,529
Operating (loss) profit			27,550				49,701
Net (loss) earnings			$ 9,946				$ 23,147
Basic (loss) earnings per common share			$ 0.19				$ 0.44
Diluted (loss) earnings per common share			0.19				0.43
Cash dividends declared per common share			$ 0.08				$ 0.24
Third Quarter [Member]
Unaudited Quarterly Data [Line Items]
Total revenues		$ 693,877				$ 791,605
Gross Profit		457,226				488,612
Operating (loss) profit		16,700				6,565
Net (loss) earnings		$ 6,181				$ (4,092)
Basic (loss) earnings per common share		$ 0.12				$ (0.08)
Diluted (loss) earnings per common share		0.12				(0.08)
Cash dividends declared per common share		$ 0.08				$ 0.24
Fourth Quarter [Member]
Unaudited Quarterly Data [Line Items]
Total revenues	$ 684,104				$ 793,833
Gross Profit	442,721				526,375
Operating (loss) profit	(159,276)				(1,120,752)
Net (loss) earnings	$ (146,383)				$ (999,873)
Basic (loss) earnings per common share	$ (2.76)				$ (18.84)
Diluted (loss) earnings per common share	(2.76)				(18.84)
Cash dividends declared per common share	$ 0.08				$ 0.24