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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract]  
Summary of Allowance for Deferred Income Tax Valuation Allowance

 

 

Balance at

Beginning of

Period

 

 

Increase

 

 

Decrease

 

 

Balance at

End of Period

 

Deferred income tax valuation allowance:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31, 2017

$

18,109

 

 

$

—

 

 

$

(11,126

)

 

$

6,983

 

Year Ended December 28, 2016

 

25,593

 

 

 

—

 

 

 

(7,484

)

 

 

18,109

 

Year Ended December 29, 2015

 

44,700

 

 

 

—

 

 

 

(19,107

)

 

 

25,593