Interest Rate Swaps in Effect (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014
Interest Rate Swap 1
Debt Disclosure [Line Items]
Fixed Interest Rate	2.52%
Derivative, Inception Date	Feb. 23, 2011
Maturity	Feb. 23, 2016
Derivative, Notional Amount	$ 25,000,000
Interest Rate Swap 3
Debt Disclosure [Line Items]
Fixed Interest Rate	1.185%
Derivative, Inception Date	Sep. 12, 2011
Maturity	Sep. 12, 2016
Derivative, Notional Amount	15,000,000
Interest Rate Swap 5
Debt Disclosure [Line Items]
Fixed Interest Rate	0.498%
Derivative, Inception Date	Feb. 11, 2013
Maturity	Jul. 11, 2015
Derivative, Notional Amount	10,000,000
Interest Rate Swap 6
Debt Disclosure [Line Items]
Fixed Interest Rate	0.458%
Derivative, Inception Date	Feb. 11, 2013
Maturity	Oct. 11, 2015
Derivative, Notional Amount	15,000,000
Interest Rate Swap 7
Debt Disclosure [Line Items]
Fixed Interest Rate	0.64%
Derivative, Inception Date	Feb. 11, 2013
Maturity	Aug. 11, 2016
Derivative, Notional Amount	25,000,000
Interest Rate Swap 8
Debt Disclosure [Line Items]
Fixed Interest Rate	0.789%
Derivative, Inception Date	Feb. 11, 2013
Maturity	Mar. 11, 2017
Derivative, Notional Amount	25,000,000
Interest Rate Swap 9 [Member]
Debt Disclosure [Line Items]
Fixed Interest Rate	0.80%
Derivative, Inception Date	Feb. 11, 2013
Maturity	May 11, 2017
Derivative, Notional Amount	25,000,000
interest rate swap 10 [Member]
Debt Disclosure [Line Items]
Fixed Interest Rate	0.88%
Derivative, Inception Date	Feb. 11, 2013
Maturity	Jul. 11, 2017
Derivative, Notional Amount	35,000,000
interest rate swap 11 [Member]
Debt Disclosure [Line Items]
Fixed Interest Rate	1.50%
Derivative, Inception Date	Sep. 11, 2013
Maturity	Jul. 11, 2017
Derivative, Notional Amount	10,000,000
Interest Rate Swap 12 [Member]
Debt Disclosure [Line Items]
Fixed Interest Rate	0.90%
Derivative, Inception Date	Mar. 11, 2014
Maturity	Jul. 11, 2017
Derivative, Notional Amount	15,000,000
Interest Rate Swap 13 [Member]
Debt Disclosure [Line Items]
Fixed Interest Rate	1.00%
Derivative, Inception Date	Mar. 11, 2014
Maturity	Jul. 11, 2017
Derivative, Notional Amount	$ 25,000,000