Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 2,157	$ 2,519
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	49,772	46,205
Amortization of intangible assets	10,226	11,106
Deferred income taxes	(183)	1,100
Stock-based compensation expense	12,761	10,709
Loss on disposition of fixed assets	8,088	9,599
Other non-cash adjustments	2,761	2,453
Increase (decrease) in cash resulting from changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable	21,938	(30,165)
Inventories	(11,737)	(3,117)
Other assets	(8,835)	(4,643)
Accounts payable	(18,340)	(3,391)
Accrued liabilities	(7,636)	(23,042)
Other liabilities	1,146	(1,347)
Net cash provided by operating activities	62,118	17,986
Cash flows from investing activities:
Purchase of property, equipment and satellites	(120,577)	(65,954)
Cash paid for patents, licenses and other assets	(21,003)	(17,145)
Payments related to acquisition of business, net of cash acquired		(3,613)
Other investing activities	(504)
Net cash used in investing activities	(142,084)	(86,712)
Cash flows from financing activities:
Payment of debt issuance costs	(6,322)	(803)
Proceeds from issuance of common stock under equity plans	6,709	5,170
Purchase of common stock in treasury (immediately retired) related to tax withholdings for stock-based compensation	(1,937)	(531)
Other financing activities	(376)	(372)
Net cash provided by financing activities	85,310	58,759
Effect of exchange rate changes on cash	(180)	198
Net increase (decrease) in cash and cash equivalents	5,164	(9,769)
Cash and cash equivalents at beginning of period	42,088	52,263
Cash and cash equivalents at end of period	47,252	42,494
Non-cash investing and financing activities:
Issuance of common stock in satisfaction of certain accrued employee compensation liabilities	13,080	11,609
Capital expenditures not paid for	21,798	8,566
Revolving Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings	20,000	85,000
Payments of revolving credit facility borrowings		(70,000)
Ex-Im Credit Facility [Member]
Cash flows from financing activities:
Proceeds from credit facility borrowings	67,236	$ 40,295
Non-cash investing and financing activities:
Exposure fees on Ex-Im credit facility expected to be financed through Ex-Im credit facility	$ 7,382