Commitments and Contingencies (Details Numeric) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 29, 2017 USD ($)	Mar. 03, 2017 USD ($) buildings	Dec. 02, 2016 USD ($)	[1]
Property Subject to Operating Lease [Line Items]
Number of Corporate Headquarter Office Buildings | buildings		3
Lease Receivable Purchased		$ 80,439	$ 80,439
Almaden Tower [Member]
Property Subject to Operating Lease [Line Items]
Lease Receivable Purchased		80,400
Option to Purchase Buildings		103,600
Residual Value Guarantees		$ 89,400
Almaden Tower [Member] | Subsequent Event [Member]
Property Subject to Operating Lease [Line Items]
Investment in Lease Receivable Applied to Building Purchase	$ 80,400
Option to Purchase Buildings	103,600
Capitalized Amount for Building Purchase	$ 104,200

[1] The condensed consolidated balance sheet as of December 2, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.