CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts	$ 15,985	$ 17,149
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000	100,000
Common Stock, Shares, Issued	42,339	42,339
Common Stock, Shares, Outstanding	38,605	38,175
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	1,000	1,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Treasury Stock, Shares	3,734	4,164