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Schedule II - Valuation And Qualifying Accounts And Reserves
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts and Reserves
Year Ended December 31,
 
 
Additions
 
 
 
 
Description
 
Balance at
Beginning
of Year
 
Charged to
Costs and
Expenses
 
Charged
to Other
Accounts
 
(Deductions)
 
Balance
at End
of Year
Allowance for doubtful accounts:
 
 
 
 
 
 
 
 
 
 
2016
 
$
649

 
$
—

 
$
—

 
$
(126
)
 
$
523

2015
 
784

 
—

 
—

 
(135
)
 
649

2014
 
651

 
133

 
—

 
—

 
784

Deferred income tax valuation allowance:
 
 
 
 
 
 
 
 
 
 
2016
 
$
14,548

 
$
—

 
$
3,374

 
$
—

 
$
17,922

2015
 
16,509

 
(1,142
)
 
(819
)
 
—

 
14,548

2014
 
14,738

 
—

 
1,771

 
—

 
16,509