SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
SEGMENT REPORTING
Number of reportable segments									4
Revenue
Revenue	$ 77,028	$ 79,350	$ 71,625	$ 64,832	$ 69,912	$ 73,312	$ 68,827	$ 65,745	$ 292,835	$ 277,796	$ 262,807
Depreciation and amortization									48,737	50,587	51,250
Non-cash stock-based compensation									4,454	3,323	2,737
Operating income (loss)	16,063	20,038	15,906	12,078	21,120	16,171	10,933	8,414	64,085	56,638	43,362
Segment Assets
Net fixed assets	254,632				238,324				254,632	238,324
Goodwill	45,077				45,077				45,077	45,077	45,077
Total assets	859,719				910,875				859,719	910,875
Capital Expenditures
Capital expenditures									69,316	42,154	41,331
U.S. Wireless
Revenue
Revenue									107,930	102,817	98,704
International wireless
Revenue
Revenue									91,432	81,463	73,004
Wireline
Revenue
Revenue									84,585	85,524	84,957
Equipment and Other
Revenue
Revenue									8,888	7,992	6,142
Reconciling Items
Revenue
Depreciation and amortization									2,967	2,625	1,889
Non-cash stock-based compensation									3,805	3,324	2,766
Operating income (loss)									(25,978)	(21,040)	(16,920)
Segment Assets
Net fixed assets	6,731				11,954				6,731	11,954
Total assets	395,692				448,676				395,692	448,676
Capital Expenditures
Capital expenditures									3,881	2,956	3,420
Reconciling Items | Discontinued operations
Segment Assets
Total assets	4,748				380,765				4,748	380,765
U.S. Wireless
Segment Assets
Goodwill	32,148				32,148				32,148	32,148	32,148
U.S. Wireless | Operating segments
Revenue
Revenue									109,005	103,768	99,260
Depreciation and amortization									14,308	16,072	18,266
Operating income (loss)									54,867	60,290	41,021
Segment Assets
Net fixed assets	73,592				47,148				73,592	47,148
Goodwill	32,148				32,148				32,148	32,148
Total assets	146,346				161,038				146,346	161,038
Capital Expenditures
Capital expenditures									34,895	9,792	7,773
U.S. Wireless | Operating segments | U.S. Wireless
Revenue
Revenue									107,930	102,817	98,704
U.S. Wireless | Operating segments | Wireline
Revenue
Revenue									610	603	556
U.S. Wireless | Operating segments | Equipment and Other
Revenue
Revenue									465	348
International Integrated Telephony | Operating segments
Revenue
Revenue									93,446	94,135	92,441
Depreciation and amortization									17,975	17,963	18,058
Operating income (loss)									28,212	23,203	26,734
Segment Assets
Net fixed assets	118,917				127,988				118,917	127,988
Total assets	197,903				193,153				197,903	193,153
Capital Expenditures
Capital expenditures									12,452	14,369	19,317
International Integrated Telephony | Operating segments | International wireless
Revenue
Revenue									30,334	27,084	27,138
International Integrated Telephony | Operating segments | Wireline
Revenue
Revenue									61,475	65,313	64,471
International Integrated Telephony | Operating segments | Equipment and Other
Revenue
Revenue									1,637	1,738	832
Island Wireless
Segment Assets
Goodwill	5,438				5,438				5,438	5,438	5,438
Island Wireless | Operating segments
Revenue
Revenue									67,653	60,096	51,176
Depreciation and amortization									10,305	11,067	9,855
Operating income (loss)									8,610	(3,334)	(7,728)
Segment Assets
Net fixed assets	29,310				33,745				29,310	33,745
Goodwill	5,438				5,438				5,438	5,438
Total assets	74,427				77,120				74,427	77,120
Capital Expenditures
Capital expenditures									5,536	4,529	7,485
Island Wireless | Operating segments | International wireless
Revenue
Revenue									61,098	54,379	45,866
Island Wireless | Operating segments | Equipment and Other
Revenue
Revenue									6,555	5,717	5,310
U.S. Wireline
Segment Assets
Goodwill	7,491				7,491				7,491	7,491	7,491
U.S. Wireline | Operating segments
Revenue
Revenue									22,731	19,797	19,930
Depreciation and amortization									3,182	2,860	3,182
Operating income (loss)									(1,076)	(2,481)	255
Segment Assets
Net fixed assets	26,082				17,489				26,082	17,489
Goodwill	7,491				7,491				7,491	7,491
Total assets	45,351				30,888				45,351	30,888
Capital Expenditures
Capital expenditures									12,552	10,508	3,336
U.S. Wireline | Operating segments | Wireline
Revenue
Revenue									22,500	19,608	19,930
U.S. Wireline | Operating segments | Equipment and Other
Revenue
Revenue									$ 231	$ 189