CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 47,898		$ 42,866
Other Comprehensive Income, Net of Tax:
Unrealized Gain (Loss) on Available-for-Sale Securities	62	[1]	(274)	[1]
Unrealized Gain on Derivatives - Other	66	[1]	66	[1]
Other Comprehensive Income (Loss) of Affiliated Companies	(18)	[1]	5,014	[1]
Other Comprehensive Income - Net of Tax	110	[1]	4,806	[1]
Comprehensive Income	$ 48,008		$ 47,672

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