Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 778	$ 676	$ 3,261	$ 3,043
Unrecognized Compensation Cost		$ 4,616		$ 4,616
Expiration date of the 2007 stock incentive plan				May 20, 2024
Maximum number of shares granted under restricted stock, unrestricted stock, RSU's and stock options to officers, employees and employee directors (in shares)		6,500,000		6,500,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 778	676	$ 3,047	2,880
Unrecognized Compensation Cost		$ 4,616		$ 4,616
Weighted Average Remaining Amortization Periods				1 year 4 months 24 days
Equity Awards Other Than Options Outstanding:
Balance (in shares)				986,000
Balance (in dollars per share)				$ 13.34
Granted (in shares)				252,000
Granted (in dollars per share)				$ 18.90
Vested (in shares)	[1]			(334,000)
Vested (in dollars per share)	[1]			$ 13.67
Cancelled or forfeited (in shares)				0
Cancelled or forfeited (in dollars per share)				$ 0
Balance (in shares)		904,000		904,000
Balance (in dollars per share)		$ 14.77		$ 14.77
Expected to vest (in shares)		904,000		904,000
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 0	$ 0	$ 214	$ 163
Unrecognized Compensation Cost		$ 0		$ 0
Weighted Average Remaining Amortization Periods				0 years
Equity Awards Other Than Options Outstanding:
Balance (in shares)				157,000
Granted (in shares)				10,000
Granted (in dollars per share)				$ 21.35
Dividend equivalents issued				1,000
Balance (in shares)		168,000		168,000
Scheduled to Vest January 1, 2019 [Member] | Performance Vested Restricted Stock Units [Member]
Equity Awards Other Than Options Outstanding:
Balance (in shares)		213,000		213,000
Expected to vest (in shares)		213,000		213,000
Not expected to vest (in shares)		0		0
Scheduled to Vest January 1, 2020 [Member] | Performance Vested Restricted Stock Units [Member]
Equity Awards Other Than Options Outstanding:
Balance (in shares)		167,000		167,000
Expected to vest (in shares)		167,000		167,000
Not expected to vest (in shares)		0		0
Scheduled to Vest January 1, 2021 [Member] | Performance Vested Restricted Stock Units [Member]
Equity Awards Other Than Options Outstanding:
Balance (in shares)		141,000		141,000
Expected to vest (in shares)		141,000		141,000
Not expected to vest (in shares)		0		0

[1] The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.