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Detail of Certain Balance Sheet Accounts - Current and Long-Term Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Balance at beginning of year $ 4,465 $ 2,752  
Charged to bad debt expense (recoveries of bad debt expense) 7,169 87 $ (543)
Deductions for uncollectible receivables written off (recoveries of uncollectible receivables)   1,626  
Deductions for uncollectible receivables written off (recoveries of uncollectible receivables) (5,795)    
Balance at end of year $ 5,839 $ 4,465 $ 2,752