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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (decrease) in valuation allowance   $ (49,600)  
Accounts Receivable Reserves      
Balance at beginning of period $ 1,630 1,066 $ 2,017
Charged to cost and expenses 2,173 1,604 395
Write-offs (2,694) (1,040) (1,346)
Balance at end of period 1,109 1,630 1,066
Valuation Allowance Of Deferred Tax Assets [Member]      
Balance at beginning of period 11,125 59,391 67,907
Net additions charged to income (expense) 874 [1] (47,659) (7,957)
Write-offs (13) (607) (559)
Balance at end of period $ 11,986 $ 11,125 $ 59,391
[1] The Company recorded the release of a valuation allowance associated with its U.S. federal, certain state and foreign deferred tax assets of $49.6 million.