SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 1,453	$ 1,591	$ 4,099
Charged to Cost/Expense	319	250	(829)
Charged to Other Accounts	(5)	1	(31)
Deductions	(57)	(389)	(1,648)
Balance at End of Period	$ 1,710	$ 1,453	$ 1,591