Stock-Based Compensation Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 01, 2016	May 01, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement [Line Items]
Stock options terms (in years)					10 years
Stock-based compensation expense			$ 1,820	$ 1,767	$ 3,256	$ 2,838
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan			384,000		384,000
Awards granted in period (in shares)	12,000
Stock-based compensation expense					$ 175
Employee Equity Plan [Member]
Statement [Line Items]
Awards vesting period (in years)					3 years
Shares reserved for future grants under the stock option and compensation plan			11,500,000		11,500,000
Performance Shares [Member] | Employee Equity Plan [Member]
Statement [Line Items]
Awards granted in period (in shares)		356,000
Restricted Stock Units (RSUs) [Member] | Employee Equity Plan [Member]
Statement [Line Items]
Awards granted in period (in shares)		163,000