CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Consolidated Statements of Comprehensive Income
Net income	$ 53,471		$ 40,184
Other comprehensive income (loss), net of tax
Unrealized gains (losses) on available-for-sale securities	(3)	[1]	29	[1]
Unrealized gains (losses) on cash flow hedges	4,814	[2]	(6,677)	[2]
Total other comprehensive income (loss), net of tax	4,811		(6,648)
Comprehensive income	$ 58,282		$ 33,536

[1] Net of ($2) and $16 for the three months ended March 31, 2013 and 2012, respectively.

[2] Net of $2,592 and ($3,595) for the three months ended March 31, 2013 and 2012, respectively.