Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income		$ 27,055	$ 43,097
Other comprehensive income/(loss), net of tax:
Changes in unrealized gains/(losses) on available-for-sale securities	[1],[2]	(1,028)	6,945
Amortization of losses of securities transferred to held-to-maturity from available-for-sale	[1]	509	731
Changes in unrealized losses on cash flow hedging instruments	[1],[3]	(4,980)	(225)
Foreign currency translation adjustment	[1]	(2,186)	(3,978)
Total other comprehensive income/(loss), net of tax		(7,685)	3,473
Comprehensive income		19,370	46,570
Changes in unrealized gains (losses) on available-for-sale securities, tax (benefit) expense		(4,700)	2,400
Reclassifications to earnings of realized gains on available-for-sale securities		0	0
Reclassifications to earnings of losses on cash flow hedging instruments		$ 1,300	$ 1,200

[1] Net of tax benefit of $4.7 million and tax expense of $2.4 million for the three months ended March 31, 2016 and 2015, respectively.

[2] There were no reclassifications to earnings of realized gains during the three months ended March 31, 2016 and 2015, respectively

[3] Amounts are net of reclassifications to earnings of losses of $1.3 million and $1.2 million for the three months ended March 31, 2016 and 2015, respectively.