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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 
Balance at
Credited/
Charges
Balance at
 
Beginning of
Charged to
Utilized/
End of
(in thousands)
Period
Net Income
Write-Offs
Period
Allowances for Doubtful Accounts and Authorized Credits
 
 
 
 
Year ended December 31, 2016
$
1,158

1,418

(2,284
)
$
292

Year ended December 31, 2015
$
388

2,085

(1,315
)
$
1,158

Year ended December 31, 2014
$
865

947

(1,424
)
$
388

Tax Valuation Allowance
 
 
 
 
Year ended December 31, 2016
$
5,276

413

—

$
5,689

Year ended December 31, 2015
$
6,945

—

(1,669
)
$
5,276

Year ended December 31, 2014
$
5,194

1,751

—

$
6,945