Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 45,188	$ 102,199	$ 132,196	$ 203,964
Other Comprehensive (Loss) Income:
Net unrealized (loss) gain on investments, net of taxes	(396)	(49)	(320)	203
Realized gain on investments	0	0	0	(38)
Amortization of (gain) loss on derivatives	0	0	5,007	0
Net unrealized (loss) gain on derivatives	(3,423)	83	(3,042)	135
Amortization of (gain) loss on derivatives	(28)	404	681	1,280
Retirement liability adjustment	361	96	1,081	244
Total	(3,486)	534	3,407	1,824
Comprehensive Income	41,702	102,733	135,603	205,788
Comprehensive Income Attributable to Noncontrolling Interests	(1,787)	(1,870)	(5,119)	(4,936)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 39,915	$ 100,863	$ 130,484	$ 200,852