SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance For Doubtful Accounts [Member]
Balance at Beginning of Year	$ 3,719	$ 3,023	$ 2,651
Additions Charged to Expense	1,504	1,840	2,616
Acquired from Acquisitions	0	1,123	0
Deductions	1,592	2,267	2,244
Balance at End of Year	3,631	3,719	3,023
Valuation Allowance Of Deferred Tax Assets [Member]
Balance at Beginning of Year	244,927	230,359	228,019
Additions Charged to Expense	34,518	14,015	2,084
Acquired from Acquisitions	0	0	0
Deductions	175	553	256
Balance at End of Year	$ 279,620	$ 244,927	$ 230,359