Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Shareholders' Equity [Member]	Non-Controlling Interest [Member]
Balance, beginning of period at Dec. 31, 2010	$ 2,543,878	$ 4	$ 782,805	$ 1,743,880	$ (112,802)	$ 107,839	$ 2,521,726	$ 22,152
Balances (in shares) at Dec. 31, 2010		70,816,000			2,608,000
Net income	289,824			285,875			285,875	3,949
Other comprehensive income (loss)	21,140					21,140	21,140
Treasury stock purchases (in shares)					562,000
Treasury stock purchases	(26,446)				(26,446)		(26,446)
Exercise of stock options (in shares)		717,000			210,000
Exercise of stock options	14,541		25,957		(11,416)		14,541
Tax benefit on exercise of stock options	659		659				659
Stock-based compensation	9,396		9,396				9,396
Cash dividends on common stock	(76,423)			(76,423)			(76,423)
Capital calls and distributions, net	10,083							10,083
Balance, end of period at Dec. 31, 2011	2,786,652	4	818,817	1,953,332	(150,664)	128,979	2,750,468	36,184
Balances (in shares) at Dec. 31, 2011		71,533,000			3,380,000
Net income	354,124			351,191			351,191	2,933
Other comprehensive income (loss)	20,941					20,941	20,941
Treasury stock purchases (in shares)					384,000
Treasury stock purchases	(20,558)				(20,558)		(20,558)
Exercise of stock options (in shares)		882,000			324,000
Exercise of stock options	14,650		32,311		(17,661)		14,650
Tax benefit on exercise of stock options	120		120				120
Stock-based compensation	8,030		8,030				8,030
Cash dividends on common stock	(166,982)			(166,982)			(166,982)
Acquisition of non-controlling interest	1,645							1,645
Capital calls and distributions, net	(4,941)							(4,941)
Balance, end of period at Dec. 31, 2012	2,993,681	4	859,278	2,137,541	(188,883)	149,920	2,957,860	35,821
Balances (in shares) at Dec. 31, 2012		72,415,000			4,088,000
Net income	318,931			316,609			316,609	2,322
Other comprehensive income (loss)	(175,543)					(175,543)	(175,543)
Treasury stock purchases (in shares)					0
Treasury stock purchases	0				0		0
Exercise of stock options (in shares)		748,000			217,000
Exercise of stock options	16,566		30,029		(13,463)		16,566
Tax benefit on exercise of stock options	2,210		2,210				2,210
Stock-based compensation	7,069		7,069				7,069
Cash dividends on common stock	(104,722)			(104,722)			(104,722)
Capital calls and distributions, net	(3,219)							(3,219)
Balance, end of period at Dec. 31, 2013	$ 3,054,973	$ 4	$ 898,586	$ 2,349,428	$ (202,346)	$ (25,623)	$ 3,020,049	$ 34,924
Balances (in shares) at Dec. 31, 2013		73,163,000			4,305,000