Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (35,497)	$ (9,246)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	63,793	50,828
Amortization of intangible assets	14,004	13,107
Deferred income taxes	(31,055)	(9,377)
Stock-based compensation expense	19,126	15,507
Loss on disposition of fixed assets	12,549	9,196
Other non-cash adjustments	1,907	2,793
Increase (decrease) in cash resulting from changes in operating assets and liabilities:
Accounts receivable	24,125	46,500
Inventories	(22,245)	(15,193)
Other assets	(10,812)	(8,203)
Accounts payable	(386)	(11,223)
Accrued liabilities	12,226	5,348
Other liabilities	6,079	63,617
Net cash provided by operating activities	53,814	153,654
Cash flows from investing activities:
Purchase of property, equipment and satellites	(146,633)	(109,820)
Cash paid for patents, licenses and other assets	(12,155)	(18,253)
Other investing activities	(2,070)
Net cash used in investing activities	(160,858)	(128,073)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity plans	7,655	7,245
Purchase of common stock in treasury (immediately retired) related to tax withholdings for share-based awards	(5,969)	(1,931)
Other financing activities	(2,376)	(372)
Net cash provided by financing activities	91,660	4,942
Effect of exchange rate changes on cash	(1,273)	(65)
Net (decrease) increase in cash and cash equivalents	(16,657)	30,458
Cash and cash equivalents at beginning of period	71,446	130,098
Cash and cash equivalents at end of period	54,789	160,556
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	32,129	16,409
Capital expenditures not paid for	7,637	$ (5,503)
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Payments of credit facility borrowings	(22,650)
Revolving Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings	130,000
Payments of credit facility borrowings	$ (15,000)