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SEGMENT REPORTING (Tables)
 9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Summarized information by operating segment
Summarized information by operating segment consists of the following (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Revenues
 
 
 
 
 
 
 
United States
$
107,230

 
$
91,153

 
$
310,762

 
$
235,606

International
 

 
 

 
 

 
 

External customers
5,071

 
4,848

 
14,571

 
14,247

Intersegment revenue
131

 
388

 
277

 
1,154

Total international revenue
5,202

 
5,236

 
14,848

 
15,401

Intersegment eliminations
(131
)
 
(388
)
 
(277
)
 
(1,154
)
Total revenues
$
112,301

 
$
96,001

 
$
325,333

 
$
249,853

 
 
 
 
 
 
 
 
EBITDA
 

 
 

 
 

 
 

United States
$
30,855

 
$
22,688

 
$
66,609

 
$
46,302

International
(1,063
)
 
(3,047
)
 
(3,917
)
 
(6,568
)
Total EBITDA
$
29,792

 
$
19,641

 
$
62,692

 
$
39,734
Reconciliation of EBITDA to net income (loss)
Reconciliation of EBITDA to net income
 
 
 
 
 
 
 
EBITDA
$
29,792

 
$
19,641

 
$
62,692

 
$
39,734

Purchase amortization in cost of revenues
(2,954
)
 
(3,027
)
 
(9,007
)
 
(5,607
)
Purchase amortization in operating expenses
(3,680
)
 
(4,824
)
 
(11,699
)
 
(9,038
)
Depreciation and other amortization
(3,388
)
 
(2,844
)
 
(9,531
)
 
(7,554
)
Interest income
52

 
59

 
239

 
440

Interest expense
(1,736
)
 
(1,822
)
 
(5,249
)
 
(3,022
)
Income tax expense, net
(7,034
)
 
(404
)
 
(10,510
)
 
(9,752
)
Net income
$
11,052

 
$
6,779

 
$
16,935

 
$
5,201
Summarized information by operating segment, assets and liabilities
Summarized information by operating segment consists of the following (in thousands):
 
September 30,
2013
 
December 31,
2012
Property and equipment, net
 
 
 
United States
$
51,781

 
$
42,480

International
3,922

 
3,828

Total property and equipment, net
$
55,703

 
$
46,308

 
 
 
 
Goodwill
 

 
 

United States
$
692,639

 
$
692,639

International
25,400

 
25,439

Total goodwill
$
718,039

 
$
718,078

 
 
 
 
Assets
 

 
 

United States
$
1,285,779

 
$
1,215,949

International
41,963

 
40,933

Total operating segment assets
$
1,327,742

 
$
1,256,882

 
 
 
 
Reconciliation of operating segment assets to total assets
 

 
 

Total operating segment assets
$
1,327,742

 
$
1,256,882

Investment in subsidiaries
(18,344
)
 
(18,344
)
Intersegment receivables
(79,024
)
 
(73,399
)
Total assets
$
1,230,374

 
$
1,165,139

 
 
 
 
Liabilities
 

 
 

United States
$
326,850

 
$
335,855

International
77,209

 
70,108

Total operating segment liabilities
$
404,059

 
$
405,963

 
 
 
 
Reconciliation of operating segment liabilities to total liabilities
 

 
 

Total operating segment liabilities
$
404,059

 
$
405,963

Intersegment payables
(73,004
)
 
(67,167
)
Total liabilities
$
331,055

 
$
338,796