Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair value of marketable securities
Debt securities	$ 3,833	$ 141,335
Total marketable investment securities	85,512	223,615
Transfer of investments from Level 1 to Level 2	0	0
Transfer of investments from Level 2 to Level 1	0
U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	81,982	82,124
Corporate securities
Fair value of marketable securities
Debt securities	3,530	90,838
Other (including restricted)
Fair value of marketable securities
Debt securities		17,382
Equity Securities
Fair value of marketable securities
Equity securities		33,271
Fair value measurements on recurring basis
Fair value of marketable securities
Cash equivalents (including restricted)	702,331	307,406
Total marketable investment securities	85,512	223,615
Fair value measurements on recurring basis \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	81,982	82,124
Fair value measurements on recurring basis \| Corporate securities
Fair value of marketable securities
Debt securities	3,530	90,838
Fair value measurements on recurring basis \| Other (including restricted)
Fair value of marketable securities
Debt security		17,382
Fair value measurements on recurring basis \| Equity Securities
Fair value of marketable securities
Equity securities		33,271
Fair value measurements on recurring basis \| Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	4,126	25,814
Total marketable investment securities	81,982	110,599
Fair value measurements on recurring basis \| Level 1 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities	81,982	77,328
Fair value measurements on recurring basis \| Level 1 \| Equity Securities
Fair value of marketable securities
Equity securities		33,271
Fair value measurements on recurring basis \| Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	698,205	281,592
Total marketable investment securities	3,530	113,016
Fair value measurements on recurring basis \| Level 2 \| U.S. Treasury and agency securities
Fair value of marketable securities
Debt securities		4,796
Fair value measurements on recurring basis \| Level 2 \| Corporate securities
Fair value of marketable securities
Debt securities	$ 3,530	90,838
Fair value measurements on recurring basis \| Level 2 \| Other (including restricted)
Fair value of marketable securities
Debt security		$ 17,382

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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