Commitments And Contingencies Litigation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Jan. 01, 2017
Commitments and Contingencies Disclosure [Abstract]
Litigation Settlement, Amount	$ 2,000
Litigation Settlement, Expense		$ 1,850

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

No definition available.

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration