CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Service revenue	$ 98,799	$ 94,623	$ 196,041	$ 187,560
Operating expenses:
Network operations (including $160 and $114 and $332 and $227 of equity-based compensation expense for three months and six months ended June 30, 2015 and 2014, respectively, exclusive of depreciation and amortization shown separately below)	42,412	39,605	83,491	78,442
Selling, general, and administrative (including $2,938 and $1,759 and $5,908 and $3,651 of equity-based compensation expense, for three and six months ended June 30, 2015 and 2014, respectively)	28,925	26,139	58,603	52,423
Depreciation and amortization	17,371	17,301	34,883	34,505
Total operating expenses	88,708	83,045	176,977	165,370
Gain on capital lease termination			10,110
Gains on equipment transactions	719	2,731	2,268	5,026
Loss on debt extinguishment and redemption			(10,144)
Operating income	10,810	14,309	21,298	27,216
Interest income and other, net	417	268	516	404
Interest expense	(9,692)	(13,790)	(21,000)	(25,092)
Income before income taxes	1,535	787	814	2,528
Income tax (provision) benefit	(695)	421	(1,558)	(1,195)
Net (loss) income	840	1,208	(744)	1,333
Comprehensive (loss) income:
Net (loss) income	840	1,208	(744)	1,333
Foreign currency translation adjustment	1,683	(44)	(5,713)	(506)
Comprehensive (loss) income	$ 2,523	$ 1,164	$ (6,457)	$ 827
Net (loss) income per common share:
Basic and diluted net (loss) income per common share (in dollars per share)	$ 0.02	$ 0.03	$ (0.02)	$ 0.03
Dividends declared per common share (in dollars per share)	$ 0.42	$ 0.17	$ 0.77	$ 0.56
Weighted-average common shares - basic (in shares)	44,774,831	45,897,449	45,012,441	46,200,844
Weighted-average common shares - diluted (in shares)	45,054,507	46,294,966	45,012,441	46,648,415