Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 181,222	$ 307,579	$ 265,156
Other Comprehensive Income (Loss):
Net unrealized (loss) gain on investments, net of taxes	(99)	354	340
Realized gain on investments	0	(38)	0
Realized gain on derivatives	5,007	0	5,893
Net unrealized (loss) gain on derivatives	(3,061)	131	530
Amortization of loss on derivatives and designated hedges	2,798	2,052	2,299
Retirement liability adjustment	147	(10,733)	11,479
Total	4,792	(8,234)	20,541
Comprehensive Income	186,014	299,345	285,697
Comprehensive Income Attributable to Noncontrolling Interests	(6,870)	(19,571)	(44,894)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 179,144	$ 279,774	$ 240,803