CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 888		$ 10,334		$ 43,754		$ 64,409
Other Comprehensive Income (Loss), Net of Tax:
Unrealized (Loss) Gain on Available-for-Sale Securities	(23)	[1]	(136)	[1]	(297)	[1]	215	[1]
Unrealized Gain (Loss) on Derivatives - Other	66	[1]	(415)	[1]	132	[1]	(225)	[1]
Other Comprehensive Income (Loss) of Affiliated Companies	22	[1]	320	[1]	5,036	[1]	(1,962)	[1]
Other Comprehensive Income (Loss) - Net of Tax	65	[1]	(231)	[1]	4,871	[1]	(1,972)	[1]
Comprehensive Income	$ 953		$ 10,103		$ 48,625		$ 62,437
Combined statutory tax rate	41.00%		41.00%		41.00%		41.00%

[1] Determined using a combined statutory tax rate of 41%.