SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2012

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of percentage of revenues generated from a single customer that exceeds 10% of the Company's consolidated revenue

Customer	2010			2011			2012
AT&T		10	%		8	%		9	%
Verizon		15	%		15	%		15	%

Schedule of percentage of accounts receivable, from customers that exceed 10% of the Company's consolidated accounts receivable, net of allowances

Customer	2011			2012
AT&T		16	%		18	%
Verizon		12	%		13	%

Schedule of assets and liabilities of the Company measured at fair value on a recurring basis

	December 31, 2011
Description	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
Certificates of deposit	$	—	$	3,366	$	3,366
Money market funds		3,847		—		3,847
Total assets measured at fair value	$	3,847	$	3,366	$	7,213
Interest rate derivative (Note 8)	$	—	$	11,337	$	11,337
Total liabilities measured at fair value	$	—	$	11,337	$	11,337

	December 31, 2012
Description	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Total
Certificates of deposit	$	—	$	363	$	363
Money market funds		1,755	$	—		1,755
Total assets measured at fair value	$	1,755	$	363	$	2,118
Interest rate derivative (Note 8)	$	—	$	11,142	$	11,142
Total liabilities measured at fair value	$	—	$	11,142	$	11,142

Schedule of reconciliation from basic to diluted weighted average common shares outstanding

The reconciliation from basic to diluted weighted average common shares outstanding is as follows (in thousands):

	For the Year Ended December 31,
	2010		2011		2012
Basic weighted-average common shares outstanding		15,323		15,396		15,531
Stock options		160		99		88
Diluted weighted-average common shares outstanding		15,483		15,495		15,619

Schedule of anti-dilutive potential shares that were excluded from the computation of diluted weighted average shares outstanding

 The following notes the number of potential common shares not included in the above calculation because the effects of such were anti-dilutive (in thousands of shares):

	For the Year Ended December 31,
	2010		2011		2012
Stock options		126		274		367
Total		126		274		367