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COMBINED STATEMENTS OF INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
NET SERVICE FEE REVENUE      
Service fee revenue, net of contractual allowances and discounts $ 57,210 $ 58,122 $ 46,212
Provision for bad debts (2,777) (2,752) (2,211)
Net service fee revenue 54,433 55,370 44,001
OPERATING EXPENSES      
Cost of operations 38,220 38,161 31,557
Depreciation and amortization 4,728 4,607 3,856
(Gain) loss on sale of equipment (143) (35) 195
Total operating expenses 42,805 42,733 35,608
INCOME FROM OPERATIONS 11,628 12,637 8,393
Net interest expense 86 245 381
NET INCOME $ 11,542 $ 12,392 $ 8,012