Annual report pursuant to Section 13 and 15(d)

Derivatives and Risk Management (Details)

v3.8.0.1
Derivatives and Risk Management (Details)
$ in Thousands
 12 Months Ended
Dec. 28, 2017
USD ($)
derivative
Dec. 29, 2016
USD ($)
Dec. 31, 2015
USD ($)
Interest Rate Swap      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [Abstract]      
Gain (loss) recognition in other comprehensive income (loss), effective portion   $ 100 $ 43
Interest Rate Cap      
Derivative [Line Items]      
Number of instruments dedesignated as hedge | derivative 1    
Change in fair value recorded as interest expense $ 154    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [Abstract]      
Gain (loss) recognition in other comprehensive income (loss), effective portion (381) 176  
Designated as Hedging Instrument [Member] | Interest Rate Swap      
Derivative [Line Items]      
Notional amount   17,500  
Designated as Hedging Instrument [Member] | Interest Rate Cap      
Derivative [Line Items]      
Notional amount 102,500 205,000  
Derivative Asset, Noncurrent 710 2,473  
AOCI, Net of Tax (133) $ 176  
Not Designated as Hedging Instrument [Member] | Interest Rate Cap      
Derivative [Line Items]      
Notional amount 102,500    
Derivative Asset, Noncurrent 710    
AOCI, Net of Tax $ (72)