Property and Equipment (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of depreciation expense
Total depreciation expense	$ 10,980	$ 11,537	$ 21,501	$ 22,867
Computer hardware and software [Member]
Summary of depreciation expense
Total depreciation expense	5,492	5,373	10,554	10,783
Signage [Member]
Summary of depreciation expense
Total depreciation expense	2,980	2,381	5,750	4,652
Agent equipment [Member]
Summary of depreciation expense
Total depreciation expense	1,042	1,815	2,121	3,619
Office furniture and equipment [Member]
Summary of depreciation expense
Total depreciation expense	875	1,005	1,776	1,977
Leasehold improvements [Member]
Summary of depreciation expense
Total depreciation expense	$ 591	$ 963	$ 1,300	$ 1,836