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Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands | 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, 2014 | $ 2,687,594 | $ 11,005 | $ 1,005 | $ 658,918 | $ 2,069,647 | $ (52,981)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 67,158 | 0 | 0 | 0 | 67,158 | 0
Net current period other comprehensive income | 17,570 | 0 | 0 | 0 | 0 | 17,570
Cash dividends | (3,603) | 0 | 0 | 0 | (3,603) | 0
Ending balance at Mar. 31, 2015 | 2,768,719 | 11,005 | 1,005 | 658,918 | 2,133,202 | (35,411)
Beginning balance at Dec. 31, 2015 | 2,872,109 | 11,005 | 1,005 | 658,918 | 2,265,621 | (64,440)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 52,072 | 0 | 0 | 0 |  | 0
Net current period other comprehensive income | 40,616 | 0 | 0 | 0 | 0 | 40,616
Cash dividends | (3,603) | 0 | 0 | 0 | (3,603) | 0
Ending balance at Mar. 31, 2016 | $ 2,961,194 | $ 11,005 | $ 1,005 | $ 658,918 | $ 2,314,090 | $ (23,824)

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