Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Other Intangible Assets

Schedule of other intangible assets

	December 31, 2012
	Gross carrying amount		Accumulated amortization			Net book value
Customer relationships	$	36,314	$	(18,065	)	$	18,249
Preferred provider agreements	7,970		(7,970		)	—
Total	$	44,284	$	(26,035	)	$	18,249

	December 31, 2011
	Gross carrying amount		Accumulated amortization			Net book value
Customer relationships	$	36,314	$	(15,234	)	$	21,080
Preferred provider agreements	7,970		(7,195		)	775
Total	$	44,284	$	(22,429	)	$	21,855