Segment Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Segment information
Revenue	$ 172,861	$ 183,800	$ 188,606	$ 220,827	$ 162,923	$ 177,349	$ 183,464	$ 210,069	$ 766,094	$ 733,805	$ 730,401
Operating expenses	166,353	167,146	166,695	180,005	159,802	154,345	160,345	169,727	680,195	644,269	644,335
Gross margin	6,508	16,654	21,915	40,822	3,121	23,004	23,069	40,342	85,899	89,536	86,066
Corporate general & admin	4,615	7,625	7,638	10,544	7,200	8,079	6,744	9,560	30,422	31,583	29,584
Operating income (loss)	1,893	9,029	14,277	30,278	(4,079)	14,925	16,325	30,782	55,477	57,953	56,482
Other income (expense):
Interest expense	(4,110)	(3,884)	(4,146)	(4,122)	(3,984)	(4,049)	(4,407)	(4,915)	(16,262)	(17,355)	(15,308)
Gain on sale of operations, net	106	21	50	2,589	88	87	2	2,743	2,766	2,920	466
Other income, net	3,254	2,570	(840)	3,438	4,851	(4,510)	27	3,081	8,422	3,449	3,532
Total other income (expense), net	(750)	(1,293)	(4,936)	1,905	955	(8,472)	(4,378)	909	(5,074)	(10,986)	(11,310)
Income from continuing operations before income tax expense	1,143	7,736	9,341	32,183	(3,124)	6,453	11,947	31,691	50,403	46,967	45,172
Financial Services [Member]
Summary of Segment information
Revenue									411,735	391,232	380,130
Operating expenses									359,166	337,304	326,412
Gross margin									52,569	53,928	53,718
Operating income (loss)									52,569	53,928	53,718
Other income (expense):
Interest expense										(2)	(6)
Other income, net									2,063	26	201
Total other income (expense), net									2,063	24	195
Income from continuing operations before income tax expense									54,632	53,952	53,913
Employee Services [Member]
Summary of Segment information
Revenue									186,217	171,205	174,097
Operating expenses									155,311	144,528	144,552
Gross margin									30,906	26,677	29,545
Operating income (loss)									30,906	26,677	29,545
Other income (expense):
Interest expense									(30)	(28)	(25)
Other income, net									1,086	780	323
Total other income (expense), net									1,056	752	298
Income from continuing operations before income tax expense									31,962	27,429	29,843
MMP [Member]
Summary of Segment information
Revenue									138,016	141,046	148,425
Operating expenses									123,264	124,790	131,897
Gross margin									14,752	16,256	16,528
Operating income (loss)									14,752	16,256	16,528
Other income (expense):
Other income, net									208	248	300
Total other income (expense), net									208	248	300
Income from continuing operations before income tax expense									14,960	16,504	16,828
National Practices [Member]
Summary of Segment information
Revenue									30,126	30,322	27,749
Operating expenses									26,713	26,222	25,794
Gross margin									3,413	4,100	1,955
Operating income (loss)									3,413	4,100	1,955
Other income (expense):
Interest expense
Other income, net									2	10	(1)
Total other income (expense), net									2	10	(1)
Income from continuing operations before income tax expense									3,415	4,110	1,954
Corporate and Other [Member]
Summary of Segment information
Operating expenses									15,741	11,425	15,680
Gross margin									(15,741)	(11,425)	(15,680)
Corporate general & admin									30,422	31,583	29,584
Operating income (loss)									(46,163)	(43,008)	(45,264)
Other income (expense):
Interest expense									(16,232)	(17,325)	(15,277)
Gain on sale of operations, net									2,766	2,920	466
Other income, net									5,063	2,385	2,709
Total other income (expense), net									(8,403)	(12,020)	(12,102)
Income from continuing operations before income tax expense									$ (54,566)	$ (55,028)	$ (57,366)