Consolidated Statements Of Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 162,013,000				$ 84,134,000
Unrealized gains on available-for-sale securities, net of tax	(48,528,000)	[1]	8,684,000	[1]	2,103,000	[1]
Unrealized gains on cash flow hedging instruments, net of tax	6,917,000	[2]	3,045,000	[2]	(9,615,000)	[2]
Foreign currency translation adjustment, net of tax	1,663,000		1,127,000		(807,000)
Total other comprehensive income	(39,948,000)		12,856,000		(8,319,000)
Comprehensive income	122,065,000		151,429,000		75,815,000
Reclassifications to earnings of realized gains on available-for-sale securities	1,200,000		2,400,000		4,900,000
Reclassifications to earnings of losses on cash flow hedging instruments	$ 8,600,000		$ 11,400,000		$ 13,900,000

[1] Net of taxes of $32.4 million, $5.8 million, and $1.4 million for the years ended December 31, 2013, 2012, and 2011, respectively.Amounts are net of reclassifications to earnings of realized gains of $1.2 million, $2.4 million, and $4.9 million for the years ended December 31, 2013, 2012, and 2011, respectively.

[2] Amounts are net of reclassifications to earnings of losses of $8.6 million, $11.4 million, and $13.9 million for the years ended December 31, 2013, 2012, and 2011, respectively.