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Consolidated Statements of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2013	$ 2,071,462us-gaap_StockholdersEquity	$ 8,586	$ 1,033	$ 143,766	$ 1,943,345	$ (25,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,479us-gaap_NetIncomeLoss	0	0	0	22,479	0
Net current period other comprehensive income	8,674	0	0	0	0	8,674
Cash dividends	(2,885)us-gaap_DividendsCommonStockCash	0	0	0	(2,885)	0
Ending balance at Mar. 31, 2014	2,099,730us-gaap_StockholdersEquity	8,586	1,033	143,766	1,962,939	(16,594)
Beginning balance at Dec. 31, 2014	2,687,594us-gaap_StockholdersEquity	11,005	1,005	658,918	2,069,647	(52,981)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	63,816us-gaap_NetIncomeLoss	0	0	0		0
Net current period other comprehensive income	17,570	0	0	0	0
Cash dividends	(3,603)us-gaap_DividendsCommonStockCash	0	0	0	(3,603)	0
Ending balance at Mar. 31, 2015	$ 2,765,377us-gaap_StockholdersEquity	$ 11,005	$ 1,005	$ 658,918	$ 2,129,860	$ (35,411)

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

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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