CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income	$ 1,905,353	$ 881,204	$ 935,197
Other comprehensive income (loss) - derivative instruments:
Unrealized holding gains (losses) arising during the year	18,771	(11,772)	(143,598)
Losses reclassified into earnings from other comprehensive income	20,141	14,678	4,343
Other comprehensive income (loss) - other instruments:
Unrealized holding gains arising during the year	583	664	355
Gain on Sale of Securities, Net	(2,122)	0	0
Other comprehensive income – foreign currency:
Currency translation adjustments arising during the year	613	0	0
Other comprehensive income (loss)	37,986	3,570	(138,900)
Comprehensive income	1,943,339	884,774	796,297
Comprehensive (income) attributable to Noncontrolling Interests	(74,740)	(39,485)	(41,612)
Comprehensive income attributable to controlling interests	$ 1,868,599	$ 845,289	$ 754,685