SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts
VALUATION AND QUALIFYING ACCOUNTS
Balance at the Beginning of the Period	$ 6,751	$ 8,257	$ 8,560
Charged to Costs and Expenses	(381)	(595)	1,642
Deductions from Reserve	(1,954)	(911)	(1,945)
Balance at the End of the Period	4,416	6,751	8,257
Deferred tax valuation allowance
VALUATION AND QUALIFYING ACCOUNTS
Balance at the Beginning of the Period	7,033	6,326	5,619
Charged to Costs and Expenses	2,708	1,362	1,020
Deductions from Reserve	(4,901)	(655)	(313)
Balance at the End of the Period	$ 4,840	$ 7,033	$ 6,326