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 [Member]
Balance at beginning of period	$ 3,394	$ 1,485	$ 2,013
Charged to cost and expenses	1,628	3,415	191
Write-offs	(1,508)	(1,506)	(719)
Balance at end of period	3,514	3,394	1,485
Valuation Allowance Of Deferred Tax Assets [Member]
Balance at beginning of period	71,790	78,211	74,940
Charged to cost and expenses	453	(2,842)	1,059
Write-offs	(416)	(3,579)	2,212
Balance at end of period	$ 71,827	$ 71,790	$ 78,211