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
Movement in valuation and qualifying accounts
Balance at beginning of period	$ 2,178	$ 2,292	$ 1,564
Additions-charged to costs and expense	4,241	4,763	2,989
Deductions	(4,529)	(4,877)	(2,261)
Balance at end of period	1,890	2,178	2,292
Tax Valuation Allowances
Movement in valuation and qualifying accounts
Balance at beginning of period	1,765	2,946	4,418
Additions-charged to costs and expense		565	44
Deductions	(1,200)	(1,746)	(1,516)
Balance at end of period	$ 565	$ 1,765	$ 2,946