Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net (loss) income	$ (9,246)	$ 2,157
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	50,828	49,772
Amortization of intangible assets	13,107	10,226
Deferred income taxes	(9,377)	(183)
Equity in losses of unconsolidated affiliate, net	513
Stock-based compensation expense	15,507	12,761
Loss on disposition of fixed assets	9,196	8,088
Other non-cash adjustments	2,280	2,761
Increase (decrease) in cash resulting from changes in operating assets and liabilities
Accounts receivable	46,500	21,938
Inventories	(15,193)	(11,737)
Other assets	(8,203)	(8,835)
Accounts payable	(11,223)	(18,340)
Accrued liabilities	5,348	(7,636)
Other liabilities	63,617	1,146
Net cash provided by operating activities	153,654	62,118
Cash flows from investing activities:
Purchase of property, equipment and satellites	(109,820)	(120,577)
Cash paid for patents, licenses and other assets	(18,253)	(21,003)
Other investing activities		(504)
Net cash used in investing activities	(128,073)	(142,084)
Cash flows from financing activities:
Payment of debt issuance costs		(6,322)
Proceeds from issuance of common stock under equity plans	7,245	6,709
Purchase of common stock in treasury (immediately retired) related to tax withholdings for stock-based compensation	(1,931)	(1,937)
Other financing activities	(372)	(376)
Net cash provided by financing activities	4,942	85,310
Effect of exchange rate changes on cash	(65)	(180)
Net increase in cash and cash equivalents	30,458	5,164
Cash and cash equivalents at beginning of period	130,098	42,088
Cash and cash equivalents at end of period	160,556	47,252
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	16,409	13,080
Capital expenditures not paid for	$ (5,503)	21,798
Revolving Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings		20,000
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings		67,236
Non-cash investing and financing activities:
Exposure fees on Ex-Im credit facility expected to be financed through Ex-Im credit facility		$ 7,382