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Segment Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Summary of Segment information    
Revenue $ 234,781 $ 220,827
Operating expenses 190,860 180,005
Gross margin 43,921 40,822
Corporate general & admin 9,984 10,544
Operating income (loss) 33,937 30,278
Other income (expense):    
Interest expense (4,353) (4,122)
Gain on sale of operations, net 18 2,589
Other income, net 1,779 3,438
Total other income (expense) (2,556) 1,905
Income (loss) from continuing operations before income tax expense 31,381 32,183
Financial Services [Member]
    
Summary of Segment information    
Revenue 141,170 132,164
Operating expenses 105,515 97,233
Gross margin 35,655 34,931
Operating income (loss) 35,655 34,931
Other income (expense):    
Other income, net 37 30
Total other income (expense) 37 30
Income (loss) from continuing operations before income tax expense 35,692 34,961
Employee Services [Member]
    
Summary of Segment information    
Revenue 52,778 48,059
Operating expenses 42,622 39,448
Gross margin 10,156 8,611
Operating income (loss) 10,156 8,611
Other income (expense):    
Interest expense (8) (6)
Other income, net 101 116
Total other income (expense) 93 110
Income (loss) from continuing operations before income tax expense 10,249 8,721
MMP [Member]
    
Summary of Segment information    
Revenue 33,347 33,271
Operating expenses 30,912 30,520
Gross margin 2,435 2,751
Operating income (loss) 2,435 2,751
Other income (expense):    
Other income, net 51 73
Total other income (expense) 51 73
Income (loss) from continuing operations before income tax expense 2,486 2,824
National Practices [Member]
    
Summary of Segment information    
Revenue 7,486 7,333
Operating expenses 6,950 6,722
Gross margin 536 611
Operating income (loss) 536 611
Other income (expense):    
Income (loss) from continuing operations before income tax expense 536 611
Corporate and Other [Member]
    
Summary of Segment information    
Operating expenses 4,861 6,082
Gross margin (4,861) (6,082)
Corporate general & admin 9,984 10,544
Operating income (loss) (14,845) (16,626)
Other income (expense):    
Interest expense (4,345) (4,116)
Gain on sale of operations, net 18 2,589
Other income, net 1,590 3,219
Total other income (expense) (2,737) 1,692
Income (loss) from continuing operations before income tax expense $ (17,582) $ (14,934)