SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (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
Changes in valuation and qualifying accounts
Balance at Beginning of Period	$ 8,654		$ 7,079		$ 7,855
Additions: Charged to Costs and Expenses	2,671		3,368		2,173
Additions: Charged to Other Accounts	49	[1]	68	[1]	(303)	[1]
Deductions	2,976	[2]	1,861	[2]	2,646	[2]
Balance at End of Period	$ 8,398		$ 8,654		$ 7,079

[1] Currency translation adjustment.

[2] Uncollectible accounts written-off, net of recoveries.