Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Services	$ 89,902,000	$ 87,316,000	$ 258,298,000	$ 250,625,000
Subscriber equipment	21,784,000	19,900,000	57,742,000	57,822,000
Engineering and support services	4,861,000	5,578,000	16,537,000	17,744,000
Total revenue	116,547,000	112,794,000	332,577,000	326,191,000
Operating expenses:
Cost Of Services (Exclusive Of Depreciation and Amortization))	20,883,000	15,936,000	59,209,000	48,287,000
Cost of subscriber equipment	12,186,000	11,476,000	33,158,000	33,798,000
Research and development	3,981,000	5,038,000	10,222,000	11,610,000
Selling, general and administrative	18,471,000	18,767,000	58,099,000	60,133,000
Depreciation and amortization	22,944,000	11,809,000	56,652,000	37,588,000
Total operating expenses	78,465,000	63,026,000	217,340,000	191,416,000
Gain on Boeing transaction	0	0	14,189,000	0
Operating income	38,082,000	49,768,000	129,426,000	134,775,000
Other income (expense):
Interest income, net	1,246,000	700,000	2,911,000	2,258,000
Undrawn credit facility fees	0	(305,000)	(25,000)	(1,176,000)
Other income (expense), net	(20,000)	39,000	(138,000)	359,000
Total other income, net	1,226,000	434,000	2,748,000	1,441,000
Income before income taxes	39,308,000	50,202,000	132,174,000	136,216,000
Provision for income taxes	(10,055,000)	(18,647,000)	(40,195,000)	(49,287,000)
Net income	29,253,000	31,555,000	91,979,000	86,929,000
Net income attributable to common stockholders	$ 25,394,000	$ 27,696,000	$ 80,402,000	$ 75,352,000
Weighted average shares outstanding - basic	98,290	96,067	97,716	95,890
Weighted average shares outstanding - diluted	127,188	123,690	126,839	123,408
Net income attributable to common stockholders per share - basic	$ 0.26	$ 0.29	$ 0.82	$ 0.79
Net income attributable to common stockholders per share - diluted	$ 0.23	$ 0.26	$ 0.72	$ 0.70
Comprehensive income:
Net income	$ 29,253,000	$ 31,555,000	$ 91,979,000	$ 86,929,000
Foreign currency translation adjustments, net of tax	1,059,000	222,000	1,858,000	3,157,000
Unrealized gain (loss) on marketable securities, net of tax	8,000	(108,000)	1,000	159,000
Comprehensive income	30,320,000	31,669,000	93,838,000	90,245,000
Series A Preferred Stock [Member]
Other income (expense):
Preferred Stock dividends, declared and paid	0	1,750,000	1,750,000	5,250,000
Preferred Stock dividends, undeclared	1,750,000	0	3,500,000	0
Series B Preferred Stock [Member]
Other income (expense):
Preferred Stock dividends, declared and paid	0	2,109,000	2,109,000	6,327,000
Preferred Stock dividends, undeclared	$ 2,109,000	$ 0	$ 4,218,000	$ 0