SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (Allowance for doubtful accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves
Balance at Beginning of Period	$ 5,883	$ 7,626	$ 7,324
Additions Charged to Costs and Expenses (Income)	(704)	(1,637)	327
Deductions	8	106	25
Balance at End of Period	$ 5,171	$ 5,883	$ 7,626