Shareholders' Equity (Components of Other Comprehensive Income (Loss), Including the Related Income Tax Effects) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ 2,976,939	$ 2,976,939	$ 2,695,617	$ 2,352,274
Cumulative effect adjustment of stranded tax effects - ASU 2018-02	(2,974)
Other comprehensive (loss) income during the period, net of tax, before reclassification		(24,746)	24,425	(10,433)
Amount reclassified from accumulated other comprehensive income into net income, net of tax		(5,372)	(38)	(2,747)
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized (gains) losses on investment securities transferred to held-to-maturity from available-for-sale		(65)	(894)	10,560
Total other comprehensive (loss) income		(30,183)	23,493	(2,620)
Balance at end of period		3,267,570	2,976,939	2,695,617
Accumulated Unrealized Losses on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(15,813)	(15,813)	(29,309)	(17,674)
Cumulative effect adjustment of stranded tax effects - ASU 2018-02	(4,517)
Other comprehensive (loss) income during the period, net of tax, before reclassification		(20,054)	14,417	(17,554)
Amount reclassified from accumulated other comprehensive income into net income, net of tax		(24)	(27)	(4,641)
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized (gains) losses on investment securities transferred to held-to-maturity from available-for-sale		(65)	(894)	10,560
Total other comprehensive (loss) income		(20,143)	13,496	(11,635)
Balance at end of period		(42,353)	(15,813)	(29,309)
Accumulated Unrealized Gains (Losses) on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	7,164	7,164	4,165	(2,193)
Cumulative effect adjustment of stranded tax effects - ASU 2018-02	1,543
Other comprehensive (loss) income during the period, net of tax, before reclassification		4,498	3,010	4,464
Amount reclassified from accumulated other comprehensive income into net income, net of tax		(5,348)	(11)	1,894
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized (gains) losses on investment securities transferred to held-to-maturity from available-for-sale		0	0	0
Total other comprehensive (loss) income		(850)	2,999	6,358
Balance at end of period		7,857	7,164	4,165
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(33,186)	(33,186)	(40,184)	(42,841)
Cumulative effect adjustment of stranded tax effects - ASU 2018-02	0
Other comprehensive (loss) income during the period, net of tax, before reclassification		(9,190)	6,998	2,657
Amount reclassified from accumulated other comprehensive income into net income, net of tax		0	0	0
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized (gains) losses on investment securities transferred to held-to-maturity from available-for-sale		0	0	0
Total other comprehensive (loss) income		(9,190)	6,998	2,657
Balance at end of period		(42,376)	(33,186)	(40,184)
Total Accumulated Other Comprehensive Loss
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(41,835)	(41,835)	(65,328)	(62,708)
Cumulative effect adjustment of stranded tax effects - ASU 2018-02	(2,974)
Balance at end of period		$ (76,872)	$ (41,835)	$ (65,328)
ASU 2016-01
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of ASUs	(1,880)
ASU 2016-01 | Accumulated Unrealized Losses on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of ASUs	(1,880)
ASU 2016-01 | Accumulated Unrealized Gains (Losses) on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of ASUs	0
ASU 2016-01 | Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of ASUs	0
ASU 2016-01 | Total Accumulated Other Comprehensive Loss
Activity Accumulated Other Comprehensive Income [Roll Forward]
Cumulative effect adjustment from the adoption of ASUs	$ (1,880)