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Schedule II
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Schedule II
 
Balance at
Beginning
of Year
 
Charges (Credits)
to Expense
 
Deductions-
Write-offs
 
Balance at
End
of Year
 
(in thousands)
Allowance for doubtful accounts receivable:
 
 
 
 
 
 
 
Year ended December 31, 2015
$
5,945

 
$
(98
)
 
$
14

 
$
5,861

Year ended December 31, 2014
$
1,926

 
$
4,054

 
$
(35
)
 
$
5,945

Year ended December 31, 2013
$
11,005

 
$
(22
)
 
$
(9,057
)
 
$
1,926

Valuation/Allowance for deferred tax assets:
 
 
 
 
 
 
 
Year ended December 31, 2015
$
40,372

 
$
570

 
$
(3,363
)
 
$
37,579

Year ended December 31, 2014
$
41,321

 
$
3,240

 
$
(4,189
)
 
$
40,372

Year ended December 31, 2013
$
41,271

 
$
3,402

 
$
(3,352
)
 
$
41,321