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Receivables - Schedule of Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 27, 2015
Dec. 31, 2014
Receivables [Abstract]    
Billed receivables $ 51,848us-gaap_BilledContractReceivables $ 41,997us-gaap_BilledContractReceivables
Unbilled contract receivables 160,473us-gaap_UnbilledContractsReceivable 160,735us-gaap_UnbilledContractsReceivable
Receivables $ 212,321us-gaap_ReceivablesNetCurrent $ 202,732us-gaap_ReceivablesNetCurrent