CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows From Operating Activities:
Net income (loss)	$ 1,079,022	$ 1,298,205
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	457,022	540,959
Realized and unrealized losses (gains) on investments	(4,757)	(13,153)
Non-cash, stock-based compensation	8,294	24,897
Deferred tax expense (benefit)	174,842	308,610
Other, net	272,085	(78,481)
Changes in current assets and current liabilities, net	42,121	(65,303)
Net cash flows from operating activities	2,028,629	2,015,734
Cash Flows From Investing Activities:
Purchases of marketable investment securities	(631,236)	(801,916)
Sales and maturities of marketable investment securities	1,624,451	675,162
Purchases of property and equipment	(461,402)	(282,805)
Capitalized interest related to FCC authorizations (Note 2)	(734,631)	(765,239)
Other, net	60,609	16,773
Net cash flows from investing activities	(142,209)	(1,158,025)
Cash Flows From Financing Activities:
Redemption and repurchases of senior notes	(1,317,372)	(1,088,392)
Repayment of long-term debt and finance lease obligations	(21,112)	(32,651)
Net proceeds from Class A common stock options exercised and stock issued under the Employee Stock Purchase Plan	32,031	16,300
Other, net	(4,072)	(2,760)
Net cash flows from financing activities	(1,310,525)	(1,107,503)
Net increase (decrease) in cash, cash equivalents, restricted cash and cash equivalents	575,895	(249,794)
Cash, cash equivalents, restricted cash and cash equivalents, beginning of period (Note 5)	887,924	1,479,901
Cash, cash equivalents, restricted cash and cash equivalents, end of period (Note 5)	$ 1,463,819	$ 1,230,107