CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Comprehensive income:
Net income	$ 908,018	$ 658,683	$ 1,905,353
Other comprehensive income (loss) – derivative instruments:
Unrealized holding gains (losses) arising during the year	2,219	(33,306)	18,771
Losses reclassified into earnings from other comprehensive income	18,244	16,868	20,141
Other comprehensive income (loss) – other instruments:
Unrealized holding gains arising during the year	0	0	583
(Gains) realized during the year	0	0	(2,122)
Other comprehensive (loss) income – foreign currency:
Currency translation adjustments arising during the year	(327)	(552)	613
Other comprehensive income (loss)	20,136	(16,990)	37,986
Comprehensive income	928,154	641,693	1,943,339
Comprehensive (income) attributable to Noncontrolling Interests	(38,668)	(26,728)	(76,204)
Comprehensive income attributable to controlling interests	$ 889,486	$ 614,965	$ 1,867,135