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Leased Vehicles Minimum rental payments (Details)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Fiscal 2012 [Member]
Dec. 31, 2014
Fiscal 2013 [Member]
Dec. 31, 2015
Fiscal 2014 [Member]
Dec. 31, 2016
Fiscal 2015 [Member]
Dec. 31, 2017
Fiscal 2016 [Member]
Minimum Lease Payments [Line Items]            
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Operating lease commitments for years ending December 31 are as follows (in thousands): 
2013
$
15,194

2014
14,547

2015
12,761

2016
11,538

2017
9,714

Thereafter
11,283

 
$
75,037

 331448 274140 159647 33011 1657