Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

Our assets and liabilities that were measured at fair value on a recurring basis were as follows (in thousands):

	September 30, 2018								December 31, 2017
	Fair Value		Level I		Level II		Level III		Fair Value		Level I		Level II		Level III
Money market funds    (cash and cash    equivalents &    restricted cash)	$	1,474,346	$	1,474,346	$	—	$	—	$	2,163,459	$	2,163,459	$	—	$	—
Interest rate swaps,    net		17,572		—		17,572		—		59		—		59		—
Total	$	1,491,918	$	1,474,346	$	17,572	$	—	$	2,163,518	$	2,163,459	$	59	$	—

Schedule of Interest Rate Swaps Outstanding

Our interest rate swaps outstanding were as follows (in thousands):

	September 30, 2018						December 31, 2017
	Aggregate Notional Amount		Gross Asset at Fair Value		Gross Liability at Fair Value		Aggregate Notional Amount		Gross Asset at Fair Value		Gross Liability at Fair Value
Interest rate swaps	$	469,707	$	17,572	$	—	$	496,544	$	5,304	$	5,245

Our interest rate swaps activity was as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Gross gains	$	5,401	$	440	$	17,811	$	2,989
Gross losses		39		1,641		1,244		12,836

Schedule of Estimated Fair Values and Carrying Values

The following table presents the estimated fair values and the carrying values (in thousands):

	September 30, 2018				December 31, 2017
	CarryingValue		Fair Value		CarryingValue		Fair Value
Convertible senior notes	$	3,851,725	$	4,051,562	$	3,722,673	$	4,488,651
Senior notes	$	1,777,948	$	1,516,500	$	1,775,550	$	1,732,500
Participation interest	$	18,595	$	18,067	$	17,545	$	17,042
Solar asset-backed notes	$	857,721	$	875,584	$	880,415	$	898,145
Solar loan-backed notes	$	202,938	$	209,236	$	236,844	$	248,149
Automotive asset-backed notes	$	417,462	$	418,209	$	—	$	—