CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Wireless	$ 119,014	$ 132,402	$ 149,448
Software	70,614	67,871	60,304
Total revenue	189,628	200,273	209,752
Operating expenses:
Cost of revenue	33,851	32,556	27,915
Service, rental and maintenance	44,401	45,485	47,471
Selling and marketing	27,446	30,013	26,617
General and administrative	42,159	45,896	46,105
Severance	2,701	1,495	983
Depreciation, amortization and accretion	13,970	16,677	15,167
Total operating expenses	164,528	172,122	164,258
Operating income	25,100	28,151	45,494
Interest income (expense), net	16	(456)	(260)
Other income (expense), net	1,182	(368)	105
Income before income tax expense	26,298	27,327	45,339
Income tax benefit (expense)	57,937	(6,582)	(17,809)
Net income	$ 84,235	$ 20,745	$ 27,530
Basic net income per common share (usd per share)	$ 3.99	$ 0.96	$ 1.27
Diluted net income per common share (usd per share)	$ 3.98	$ 0.94	$ 1.25
Basic weighted average common shares outstanding (shares)	21,120,268	21,621,466	21,648,654
Diluted weighted average common shares outstanding (shares)	21,186,750	22,090,770	22,010,523
Cash distributions declared per common share (usd per share)	$ 0.63	$ 0.50	$ 0.50