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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts
Years Ended December 31, 2017, 2016 and 2015

Description
Balance at
Beginning
of Period
 
Charged to Cost and Expenses
 
Charged
to Other
Accounts
 
Deductions—
Write offs
 
Balance
at End of
Period
 
(in thousands)
Allowance for Loan Losses:
 
 
 
 
 
 
 
 
 
2017
110,162

 
152,926

 
17,199

 
(171,272
)
 
109,015

2016
53,311

 
149,963

 
7,270

 
(100,382
)
 
110,162

2015
49,804

 
74,863

 
7,129

 
(78,485
)
 
53,311

Deferred tax asset valuation allowance:
 
 
 
 
 
 
 
 
 
2017
53,603

 
(826
)
 
3,779

 
(18,805
)
 
37,751

2016
31,978

 
(24,209
)
 
45,834

 
—

 
53,603

2015
26,090

 
(2,514
)
 
8,402

 
—

 
31,978