CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows From Operating Activities:
Net income (loss)	$ 448,837	$ 850,006
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation and amortization	416,301	467,151
Realized and unrealized losses (gains) on investments	(4,759)	(113,012)
Non-cash, stock-based compensation	11,863	3,745
Deferred tax expense (benefit)	347,550	185,034
Other, net	41,716	52,419
Changes in current assets and current liabilities, net	231,588	146,307
Net cash flows from operating activities	1,493,096	1,591,650
Cash Flows From Investing Activities:
Purchases of marketable investment securities	(72,224)	(136,212)
Sales and maturities of marketable investment securities	92,671	563,416
Settlement of derivative financial instruments		562,234
Purchases of property and equipment	(212,387)	(319,766)
Capitalized interest related to FCC authorizations (Note 2)	(452,421)	(405,071)
Purchases of FCC authorizations (Note 10)	(4,711,154)
Purchase of strategic investments	(90,381)
Other, net	10,754	9,049
Net cash flows from investing activities	(5,435,142)	273,650
Cash Flows From Financing Activities:
Proceeds from issuance of senior notes		2,000,000
Proceeds from issuance of convertible notes (Note 9)	1,000,000
Redemption and repurchases of senior notes		(1,500,000)
Repayment of long-term debt and capital lease obligations	(20,086)	(20,858)
Payments made to parent of transferred businesses	(7,098)	(48,163)
Net proceeds from Class A common stock options exercised and stock issued under the Employee Stock Purchase Plan	16,778	7,443
Debt issuance costs	(6,158)
Other, net		(7,548)
Net cash flows from financing activities	983,436	430,874
Net increase (decrease) in cash and cash equivalents	(2,958,610)	2,296,174
Cash and cash equivalents, beginning of period	5,324,503	1,053,983
Cash and cash equivalents, end of period	$ 2,365,893	$ 3,350,157