Other Accrued Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

Other Accrued Liabilities [Abstract]

Components of other accrued liabilities

Other accrued liabilities consisted of the following:

	December 31, 2012		June 30, 2013
Accrued systems rental and maintenance costs	$	2,768	$	2,626
Accrued site rental fees	1,202		1,164
Accrued property and sales taxes payable	11,561		11,515
Accrued self-insurance expense	1,299		1,178
Deferred gain on sale of equipment	1,293		324
Other accrued expenses	8,712		6,556
Total	$	26,835	$	23,363