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
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 6,202		$ 3,540		$ 3,006
Charged to Cost and Expenses	1,283		3,101		679
Charged to Other Accounts	454		193		0
Deductions	(735)	[1]	(632)	[1]	(145)	[1]
Balance At End of Year	$ 7,204		$ 6,202		$ 3,540

[1] Uncollectible accounts written off, net of recoveries.