Goodwill and Other Intangible Assets, (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Changes in goodwill
Goodwill Gross, balance at beginning of the period	$ 21,932
Accumulated Impairment, balance at beginning of the period	(15,425)
Goodwill Net, balance at beginning of the period	6,507
Additions through acquisitions	109,170
Impairment	(406)
Goodwill Gross, balance at end of the period	131,102
Accumulated Impairment, balance at end of the period	(15,831)
Goodwill Net, balance at end of the period	115,271
Changes in intangible assets, net
Balance at the beginning of the period	18,411
Purchases of intangible assets	87,255
Amortization expense	(7,596)
Impairment	(1,420)
Balance at the end of the period	$ 96,650