CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Net Income	$ 35,038		$ 32,296
Other Comprehensive Gain (Loss) - Net of Tax:
Unrealized Gain (Loss) on Available-for-Sale Securities	351		(154)
Unrealized Gain on Derivatives - Other	7		7
Other Comprehensive Gain (Loss) - Net of Tax	358	[1]	(147)	[1]
Comprehensive Income	$ 35,396		$ 32,149

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