CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income		$ 5,043	$ 5,226	$ 49,461	$ 47,813
Other Comprehensive Income (Loss) - Net of Tax:
Unrealized Gain (Loss) on Available-for-Sale Securities	[1]	3	(37)	7	17
Unrealized Gain on Derivatives - Other	[1]	7	7	14	9
Other Comprehensive Income (Loss) - Net of Tax	[1]	10	(30)	21	26
Comprehensive Income		$ 5,053	$ 5,196	$ 49,482	$ 47,839

[1] Determined using a combined average statutory tax rate of 40%.