Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 4,155,474,000	$ 4,177,385,000	$ 4,006,805,000
Cumulative effect of accounting changes				$ 23,123,000	$ 14,508,000
Adjusted opening balance				4,200,508,000	4,021,313,000
Other comprehensive income (loss) before reclassifications	3,554,000	(37,271,000)
Amounts reclassified to net income (loss)	(592,000)	31,858,000
Other comprehensive loss	6,290,000	(5,413,000)	(4,942,000)
Ending balance	3,745,553,000	4,155,474,000	4,177,385,000
Unrecognized foreign currency translation tax benefits	0	0	7,300,000
Cumulative Foreign Currency Translation Adjustments
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(121,693,000)	(119,430,000)
Cumulative effect of accounting changes				0
Adjusted opening balance				(119,430,000)
Other comprehensive income (loss) before reclassifications	(483,000)	(34,399,000)
Amounts reclassified to net income (loss)	0	32,136,000
Other comprehensive loss	(483,000)	(2,263,000)
Ending balance	(122,176,000)	(121,693,000)	(119,430,000)
Unrealized Gain (Loss) On Available-For-Sale Securities
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,574,000)	(10,801,000)
Cumulative effect of accounting changes				10,467,000
Adjusted opening balance				(334,000)
Other comprehensive income (loss) before reclassifications	2,571,000	(962,000)
Amounts reclassified to net income (loss)	(592,000)	(278,000)
Other comprehensive loss	1,979,000	(1,240,000)
Ending balance	405,000	(1,574,000)	(10,801,000)
Other
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,833,000)	77,000
Cumulative effect of accounting changes				0
Adjusted opening balance				77,000
Other comprehensive income (loss) before reclassifications	1,466,000	(1,910,000)
Amounts reclassified to net income (loss)	0	0
Other comprehensive loss	1,466,000	(1,910,000)
Ending balance	(367,000)	(1,833,000)	77,000
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(125,100,000)	(130,154,000)	(124,803,000)
Cumulative effect of accounting changes				10,467,000
Adjusted opening balance				$ (119,687,000)	$ (124,803,000)
Other comprehensive loss	2,962,000	(5,413,000)
Ending balance	$ (122,138,000)	$ (125,100,000)	$ (130,154,000)