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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (decrease) in valuation allowance $ (49,600)    
Accounts Receivable Reserves      
Balance at beginning of period 1,066 $ 2,017 $ 2,625
Charged to cost and expenses 1,604 395 619
Write-offs (1,040) (1,346) (1,227)
Balance at end of period 1,630 1,066 2,017
Valuation Allowance Of Deferred Tax Assets [Member]      
Balance at beginning of period 59,391 67,907 71,827
Net additions charged to income (expense) (47,659) [1] (7,957) (2,786)
Write-offs (607) (559) (1,134)
Balance at end of period $ 11,125 $ 59,391 $ 67,907
[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.