Long-term Debt and Capital Lease Obligations SPLP Credit Facility (Details) - USD ($)		6 Months Ended
	Mar. 27, 2015	Jun. 30, 2015	Apr. 30, 2014
London Interbank Offered Rate (LIBOR) | Credit Agreement
Debt Instrument [Line Items]
Description of variable rate basis		LIBOR
Basis spread on variable rate (as a percent)	0.50%
Base Rate | Credit Agreement
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.50%
Line of Credit | Line of Credit
Debt Instrument [Line Items]
Amount outstanding			$ 47,500,000
PNC Bank, National Association | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 10,000,000
Outstanding amount on letter of credit		$ 893,000
Weighted average rate (as a percent)		1.72%
PNC Bank, National Association | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 75,000,000
Minimum | PNC Bank, National Association | Letter of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	10,000,000
Maximum | PNC Bank, National Association | Letter of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 100,000,000
CoSine Communications, Inc. (CoSine) | Line of Credit | Line of Credit
Debt Instrument [Line Items]
Amount outstanding		$ 37,000,000