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Summary of Operations and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]  
Summary of Allowance for Doubtful Accounts

Our allowance for doubtful accounts activity is summarized as follows (in thousands):

 

 

 

2018

 

 

2017

 

 

2016

 

Balance at January 1,

 

 

 

 

 

 

 

 

 

 

 

 

Allowance for doubtful accounts

 

$

265

 

 

$

78

 

 

$

268

 

Charges to expense

 

 

268

 

 

 

192

 

 

 

(115

)

Write-offs of uncollectible accounts, net

   of recoveries

 

 

 

 

 

(5

)

 

 

(75

)

Balance at December 31,

 

 

 

 

 

 

 

 

 

 

 

 

Allowance for doubtful accounts

 

$

533

 

 

$

265

 

 

$

78

 

Property Plant And Equipment Estimated Useful Life Table Text Block

Depreciation of property, equipment and software is calculated using either straight-line or accelerated methods over estimated useful lives of the related assets or lease terms, as follows:

 

 

 

Years

Buildings

 

39

Office furniture and fixtures

 

7

Computer hardware and software

 

3-10

Leasehold improvements

 

Shorter of lease term or estimated useful life

Schedule of Reconciles of Cash, Cash Equivalents and Restricted Cash Balances The table below reconciles the cash, cash equivalents and restricted cash balances from our consolidated balance sheets to the amounts reported on the consolidated statements of cash flows (in thousands):

 

 

 

December 31,

 

 

December 31,

 

 

December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

Cash and cash equivalents

 

$

35,371

 

 

$

59,835

 

 

$

50,768

 

Restricted cash, included in restricted cash and investments

 

 

105,331

 

 

 

60,370

 

 

 

290,562

 

Total cash, cash equivalents and restricted cash shown in the

   statement of cash flows

 

$

140,702

 

 

$

120,205

 

 

$

341,330

 

 

Summary of Basic and Diluted Common Shares Outstanding Basic and diluted shares outstanding are summarized as follows (in thousands):

 

 

 

Year Ended

 

 

 

December 31,

 

 

 

2018

 

 

2017

 

 

2016

 

Weighted average number of basic shares outstanding

 

 

7,342

 

 

 

7,275

 

 

 

7,226

 

Effect of dilutive securities

 

 

305

 

 

 

276

 

 

 

152

 

Weighted average number of diluted shares outstanding

 

 

7,647

 

 

 

7,551

 

 

 

7,378