SCHEDULE II - VALUATIONS AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance Beginning of Year	$ 1,812	$ 2,810	$ 2,951
Additions Charged to Cost & Expenses	795	1,351	1,223
Deductions Written Off as Uncollectible	(1,001)	(2,349)	(1,364)
Balance End of Year	$ 1,606	$ 1,812	$ 2,810