CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Service revenue	$ 84,553	$ 76,888
Operating expenses:
Network operations (including $155 and $83 of equity-based compensation expense, respectively, exclusive of depreciation and amortization shown separately below)	37,309	34,338
Selling, general, and administrative (including $2,359 and $1,155 of equity-based compensation expense, respectively)	21,465	21,343
Depreciation and amortization	15,874	15,239
Total operating expenses	74,648	70,920
Operating income	9,905	5,968
Interest income and other, net	658	375
Interest expense	(9,869)	(8,993)
Income (loss) before income taxes	694	(2,650)
Income tax (provision) benefit	(333)	560
Net income (loss)	361	(2,090)
Comprehensive income (loss):
Net income (loss)	361	(2,090)
Foreign currency translation adjustment	(1,793)	1,623
Comprehensive (loss)	$ (1,432)	$ (467)
Net loss per common share:
Basic and diluted net income (loss) per common share (in dollars per share)	$ 0.01	$ (0.05)
Dividends declared per common share (in dollars per share)	$ 0.12
Weighted-average common shares - basic (in shares)	45,537,607	45,241,418
Weighted-average common shares - diluted (in shares)	46,435,677	45,241,418