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Schedule II: Valuation and Qualifying Accounts and Reserves
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II: Valuation and Qualifying Accounts and Reserves
SCHEDULE II: VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
 
 
Balance at
Beginning
of Period
 
Additions
(Reductions)
to Costs
and
Expenses
 
Write
Offs
 
Balance at
End of Period
 
(in thousands)
Allowance for doubtful accounts(1):
 
 
 
 
 
 
 
Year Ended December 31, 2016
$
1,108

 
$
8,585

 
$
(6,747
)
 
$
2,946

Year Ended December 31, 2017
$
2,946

 
$
9,948

 
$
(7,080
)
 
$
5,814

Year Ended December 31, 2018
$
5,814

 
$
12,321

 
$
(15,757
)
 
$
2,378

Valuation allowance for deferred tax assets:
 
 
 
 
 
 
 
Year Ended December 31, 2016
$
31,685

 
$
(31,429
)
 
$
—

 
$
256

Year Ended December 31, 2017
$
256

 
$
22

 
$
—

 
$
278

Year Ended December 31, 2018
$
278

 
$
(27
)
 
$
—

 
$
251