CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows From Operating Activities:
Net income (loss)	$ 1,323,014	$ 579,680
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	376,775	318,944
Impairment of long-lived assets (Note 2)		356,418
Realized and unrealized losses (gains) on investments and derivatives	14,269	(90)
Non-cash, stock-based compensation	19,921	34,811
Deferred tax expense (benefit)	352,665	122,086
Allowance for credit losses	(22,591)	29,788
Change in long-term deferred revenue and other long-term liabilities	(17,025)	103,927
Other, net	21,375	7,867
Changes in current assets and current liabilities, net	183,496	157,465
Net cash flows from operating activities	2,251,899	1,710,896
Cash Flows From Investing Activities:
Purchases of marketable investment securities	(1,278,320)	(432,173)
Sales and maturities of marketable investment securities	502,538	807,569
Purchases of property and equipment	(378,071)	(196,717)
Capitalized interest related to FCC authorizations (Note 2)	(399,145)	(403,512)
Refund of FCC authorization deposit (Note 11)	337,490
Purchase of FCC authorizations, including deposits		(134,602)
Other, net	(42,989)	(78,116)
Net cash flows from investing activities	(1,258,497)	(437,551)
Cash Flows From Financing Activities:
Repayment of long-term debt and finance lease obligations	(35,895)	(35,576)
Redemption and repurchases of senior notes	(2,000,000)	(1,100,000)
Issuances of senior notes	1,500,000
Early debt extinguishment costs	(3,368)
Net proceeds from Class A common stock options exercised and stock issued under the Employee Stock Purchase Plan	25,093	9,076
Debt issuance costs	(9,819)
Other, net	(12,063)	1
Net cash flows from financing activities	(536,052)	(1,126,499)
Net increase (decrease) in cash, cash equivalents, restricted cash and cash equivalents	457,350	146,846
Cash, cash equivalents, restricted cash and cash equivalents, beginning of period (Note 6)	3,453,994	2,504,320
Cash, cash equivalents, restricted cash and cash equivalents, end of period (Note 6)	$ 3,911,344	$ 2,651,166