Note 2 — Composition of Certain Balance Sheet Captions

	As of March 31, 2018			As of March 31, 2017
	(In thousands)
Accounts receivable, net:
Billed	$	184,536		$	145,626
Unbilled		85,156			119,565
Allowance for doubtful accounts		(2,027	)		(1,470	)
	$	267,665		$	263,721
Inventories:
Raw materials	$	62,252		$	56,096
Work in process		47,465			25,820
Finished goods		86,590			81,285
	$	196,307		$	163,201
Prepaid expenses and other current assets:
Prepaid expenses	$	68,516		$	51,856
Other		8,619			5,980
	$	77,135		$	57,836
Satellites, net:
Satellites (estimated useful life of 10-17 years)	$	1,152,503		$	559,380
Capital lease of satellite capacity — Anik F2 (estimated useful life of 10 years)		99,090			99,090
Satellites under construction		362,342			776,354
		1,613,935			1,434,824
Less: accumulated depreciation and amortization		(373,948	)		(326,554	)
	$	1,239,987		$	1,108,270
Property and equipment, net:
Equipment and software (estimated useful life of 2-7 years)	$	864,140		$	679,008
CPE leased equipment (estimated useful life of 4-5 years)		298,746			271,917
Furniture and fixtures (estimated useful life of 7 years)		35,234			30,539
Leasehold improvements (estimated useful life of 2-17 years)		111,841			80,727
Building (estimated useful life of 24 years)		8,923			8,923
Land		15,322			14,573
Construction in progress		108,192			116,902
		1,442,398			1,202,589
Less: accumulated depreciation		(719,910	)		(661,981	)
	$	722,488		$	540,608
Other assets:
Investment in unconsolidated affiliate	$	163,835		$	141,894
Deferred income taxes		222,274			134,764
Capitalized software costs, net		246,792			203,686
Patents, orbital slots and other licenses, net		16,100			16,500
Other		37,133			32,522
	$	686,134		$	529,366
Accrued liabilities:
Collections in excess of revenues and deferred revenues	$	121,439		$	76,682
Accrued employee compensation		46,106			41,691
Accrued vacation		39,022			33,214
Warranty reserve, current portion		5,357			7,796
Other		51,752			65,576
	$	263,676		$	224,959
Other liabilities:
Deferred revenue, long-term portion	$	77,831		$	4,617
Deferred rent, long-term portion		13,769			10,743
Warranty reserve, long-term portion		1,557			3,262
Satellite performance incentive obligation, long-term portion		18,181			19,164
Deferred income taxes, long-term		864			1,936
Other		9,038			3,000
	$	121,240		$	42,722