CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Service, rental and maintenance, net of service credits	$ 143,628	$ 161,890	$ 189,568
Software revenue and other, net of credits	66,124	57,806	44,125
Total revenues	209,752	219,696	233,693
Operating expenses:
Cost of revenue	22,126	20,846	20,406
Service, rental and maintenance	50,639	55,425	62,347
Selling and marketing	26,084	23,645	22,389
General and administrative	49,259	50,680	56,095
Severance and restructuring	983	1,758	1,293
Depreciation, amortization and accretion	15,167	18,232	19,334
Impairment	0	3,382	0
Total operating expenses	164,258	173,968	181,864
Operating income	45,494	45,728	51,829
Interest expense, net	(260)	(380)	(2,254)
Gain on disposals of narrowband PCS licenses	0	0	7,500
Other income, net	105	715	450
Income before income tax (expense) benefit	45,339	46,063	57,525
Income tax (expense) benefit	(17,809)	(19,079)	26,261
Net income	$ 27,530	$ 26,984	$ 83,786
Basic net income per common share	$ 1.27	$ 1.23	$ 3.79
Diluted net income per common share	$ 1.25	$ 1.20	$ 3.72
Basic weighted average common shares outstanding	21,648,654	21,924,748	22,083,942
Diluted weighted average common shares outstanding	22,010,523	22,397,587	22,509,008
Cash distributions declared per common share	$ 0.5	$ 0.75	$ 1