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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable Reserves      
Balance at beginning of period $ 2,017 $ 2,625 $ 2,176
Charged to cost and expenses 395 619 1,655
Write-offs (1,346) (1,227) (1,206)
Balance at end of period 1,066 2,017 2,625
Valuation Allowance Of Deferred Tax Assets [Member]      
Balance at beginning of period 67,907 71,827 71,790
Charged to cost and expenses (7,957) (2,786) 453
Write-offs (559) (1,134) (416)
Balance at end of period $ 59,391 $ 67,907 $ 71,827