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SCHEDULE V - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
​
Balance
at Beginning
of Period
 
Additions
Amounts
Charged to
Expense
 
Deductions
Amounts
Written Off
or Disposals
 
Balance
at End
of Period
​
(in thousands)
Year Ended December 31, 2019
​

 
​

 
​

 
​

Allowance for Doubtful Accounts
$
3,948

 
$
2,523

 
$
(812
)
 
$
5,659

Allowance for Credit Losses on Bank Loans
—

 
8,898

 
(1,717
)
 
7,181

Total
$
3,948

 
$
11,421

 
$
(2,529
)
 
$
12,840

Year Ended December 31, 2018
​

 
​

 
​

 
​

Allowance for Doubtful Accounts
$
2,757

 
$
1,504

 
$
(313
)
 
$
3,948

Allowance for Credit Losses on Bank Loans
3,219

 
950

 
(4,169
)
 
—

Total
$
5,976

 
$
2,454

 
$
(4,482
)
 
$
3,948

Year Ended December 31, 2017
​

 
​

 
​

 
​

Allowance for Doubtful Accounts
$
2,136

 
$
1,029

 
$
(408
)
 
$
2,757

Allowance for Credit Losses on Bank Loans
943

 
2,424

 
(148
)
 
3,219

Total
$
3,079

 
$
3,453

 
$
(556
)
 
$
5,976