Interest Rate Swaps in Effect (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
Interest Rate Swap 4
Debt Disclosure [Line Items]
Notional Amount	$ 25,000,000
Fixed Interest Rate	1.61%
Effective Date	Feb. 23, 2011
Maturity Date	Feb. 24, 2014
Interest Rate Swap 5
Debt Disclosure [Line Items]
Notional Amount	25,000,000
Fixed Interest Rate	2.52%
Effective Date	Feb. 23, 2011
Maturity Date	Feb. 23, 2016
Interest Rate Swap 6
Debt Disclosure [Line Items]
Notional Amount	25,000,000
Fixed Interest Rate	0.975%
Effective Date	Jul. 18, 2011
Maturity Date	Jul. 18, 2014
Interest Rate Swap 7
Debt Disclosure [Line Items]
Notional Amount	15,000,000
Fixed Interest Rate	1.185%
Effective Date	Sep. 12, 2011
Maturity Date	Sep. 12, 2016
Interest Rate Swap 8
Debt Disclosure [Line Items]
Notional Amount	15,000,000
Fixed Interest Rate	0.62%
Effective Date	Sep. 12, 2011
Maturity Date	Sep. 11, 2014
Interest Rate Swap 9 [Member]
Debt Disclosure [Line Items]
Notional Amount	10,000,000
Fixed Interest Rate	0.498%
Effective Date	Feb. 11, 2013
Maturity Date	Jul. 11, 2015
interest rate swap 10 [Member]
Debt Disclosure [Line Items]
Notional Amount	15,000,000
Fixed Interest Rate	0.458%
Effective Date	Feb. 11, 2013
Maturity Date	Oct. 11, 2015
interest rate swap 11 [Member]
Debt Disclosure [Line Items]
Notional Amount	25,000,000
Fixed Interest Rate	0.635%
Effective Date	Feb. 11, 2013
Maturity Date	Aug. 11, 2016
Interest Rate Swap 12 [Member]
Debt Disclosure [Line Items]
Notional Amount	25,000,000
Fixed Interest Rate	0.789%
Effective Date	Feb. 11, 2013
Maturity Date	Mar. 11, 2017
Interest Rate Swap 13 [Member]
Debt Disclosure [Line Items]
Notional Amount	25,000,000
Fixed Interest Rate	0.802%
Effective Date	Feb. 11, 2013
Maturity Date	May 11, 2017
Interest rate swap 14 [Member]
Debt Disclosure [Line Items]
Notional Amount	$ 35,000,000
Fixed Interest Rate	0.88%
Effective Date	Feb. 11, 2013
Maturity Date	Jul. 11, 2017