Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 55,217	$ 86,539	$ 91,368
Other comprehensive income (loss), before tax:
Unrealized gain (loss) on derivative instruments	89	(30)	(267)
Unrealized (loss) gain on available-for-sale securities	(40)	16	17
Other comprehensive income (loss), before tax	49	(14)	(250)
Tax benefit (expense) related to items of other comprehensive income	16	(5)	(8)
Other comprehensive income (loss), net of tax	65	(19)	(258)
Comprehensive income	$ 55,282	$ 86,520	$ 91,110