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SEGMENT REPORTING (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
operating_segments
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]            
Number of business segments (in segments)     2      
Summarized information by operating segment [Abstract]            
Revenues $ 112,301,000 $ 96,001,000 $ 325,333,000 $ 249,853,000    
Property and equipment, net 55,703,000   55,703,000   46,308,000  
Goodwill 718,039,000   718,039,000   718,078,000 91,784,000
Reconciliation of EBITDA to net income (loss) [Abstract]            
EBITDA 29,792,000 19,641,000 62,692,000 39,734,000    
Purchase amortization in cost of revenues (2,954,000) (3,027,000) (9,007,000) (5,607,000)    
Purchase amortization in operating expenses (3,680,000) (4,824,000) (11,699,000) (9,038,000)    
Depreciation and other amortization (3,388,000) (2,844,000) (9,531,000) (7,554,000)    
Interest income 52,000 59,000 239,000 440,000    
Interest expense (1,736,000) (1,822,000) (5,249,000) (3,022,000)    
Income tax expense, net (7,034,000) (404,000) (10,510,000) (9,752,000)    
Net income 11,052,000 6,779,000 16,935,000 5,201,000    
Reconciliation of operating segment assets to total assets [Abstract]            
Total operating segment assets 1,327,742,000   1,327,742,000   1,256,882,000  
Investment in subsidiaries (18,344,000)   (18,344,000)   (18,344,000)  
Intersegment receivables (79,024,000)   (79,024,000)   (73,399,000)  
Total assets 1,230,374,000   1,230,374,000   1,165,139,000  
Reconciliation of operating segment liabilities to total liabilities [Abstract]            
Total operating segment liabilities 404,059,000   404,059,000   405,963,000  
Intersegment payables (73,004,000)   (73,004,000)   (67,167,000)  
Total liabilities 331,055,000   331,055,000   338,796,000  
United States [Member]
            
Segment Reporting Information [Line Items]            
U.S. corporate allocation 300,000 0 600,000 0    
Summarized information by operating segment [Abstract]            
Revenues 107,230,000 91,153,000 310,762,000 235,606,000    
Property and equipment, net 51,781,000   51,781,000   42,480,000  
Goodwill 692,639,000   692,639,000   692,639,000 67,465,000
Reconciliation of EBITDA to net income (loss) [Abstract]            
EBITDA 30,855,000 22,688,000 66,609,000 46,302,000    
Reconciliation of operating segment assets to total assets [Abstract]            
Total operating segment assets 1,285,779,000   1,285,779,000   1,215,949,000  
Reconciliation of operating segment liabilities to total liabilities [Abstract]            
Total operating segment liabilities 326,850,000   326,850,000   335,855,000  
International [Member]
            
Segment Reporting Information [Line Items]            
International corporate allocation 100,000 2,300,000 300,000 4,500,000    
Summarized information by operating segment [Abstract]            
Revenues 5,202,000 5,236,000 14,848,000 15,401,000    
Property and equipment, net 3,922,000   3,922,000   3,828,000  
Goodwill 25,400,000   25,400,000   25,439,000 24,319,000
Reconciliation of EBITDA to net income (loss) [Abstract]            
EBITDA (1,063,000) (3,047,000) (3,917,000) (6,568,000)    
Reconciliation of operating segment assets to total assets [Abstract]            
Total operating segment assets 41,963,000   41,963,000   40,933,000  
Reconciliation of operating segment liabilities to total liabilities [Abstract]            
Total operating segment liabilities 77,209,000   77,209,000   70,108,000  
External Customers [Member]
            
Summarized information by operating segment [Abstract]            
Revenues 5,071,000 4,848,000 14,571,000 14,247,000    
Intersegment Revenue [Member]
            
Summarized information by operating segment [Abstract]            
Revenues 131,000 388,000 277,000 1,154,000    
Intersegment Elimination [Member]
            
Summarized information by operating segment [Abstract]            
Revenues $ (131,000) $ (388,000) $ (277,000) $ (1,154,000)