CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities:
Net income (loss)	$ 99,274	$ 361,299
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	166,820	153,139
Impairment of long-lived assets	356,418
Realized and unrealized losses (gains) on investments	(58)	(2,617)
Non-cash, stock-based compensation	16,418	11,537
Deferred tax expense (benefit)	28,942	53,921
Allowance for credit losses	21,450	2,001
Other, net	54,529	(4,469)
Changes in current assets and current liabilities, net	132,160	158,118
Net cash flows from operating activities	875,953	732,929
Cash Flows From Investing Activities:
Purchases of marketable investment securities	(432,172)	(145,162)
Sales and maturities of marketable investment securities	287,960	513,033
Purchases of property and equipment	(97,164)	(120,859)
Capitalized interest related to FCC authorizations (Note 2)	(241,825)	(289,775)
Other, net	2,065	2,495
Net cash flows from investing activities	(481,136)	(40,268)
Cash Flows From Financing Activities:
Redemption and repurchases of senior notes		(22,365)
Repayment of long-term debt and finance lease obligations	(16,713)	(6,632)
Net proceeds from Class A common stock options exercised and stock issued under the Employee Stock Purchase Plan	5,525	4,750
Other, net	2	29,000
Net cash flows from financing activities	(11,186)	4,753
Net increase (decrease) in cash, cash equivalents, restricted cash and cash equivalents	383,631	697,414
Cash, cash equivalents, restricted cash and cash equivalents, beginning of period (Note 6)	2,504,320	887,924
Cash, cash equivalents, restricted cash and cash equivalents, end of period (Note 6)	$ 2,887,951	$ 1,585,338