Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 676	$ 1,085	$ 3,719	$ 3,371
Unrecognized Compensation Cost		$ 3,575		$ 3,575
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
Stock Options Outstanding:
Balance				77,000
Balance (in dollars per share)				$ 16.29
Exercised (in shares)				(77,334)
Vested and expected to vest [Abstract]
Stock options exercised (in shares)				77,334
Intrinsic value under share based compensation scheme				$ 20
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 0	0	0	0
Unrecognized Compensation Cost		0		$ 0
Weighted Average Remaining Amortization Periods				0 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		676	1,085	$ 3,556	3,254
Unrecognized Compensation Cost		$ 3,575		$ 3,575
Weighted Average Remaining Amortization Periods				1 year 2 months 12 days
Equity Awards Other Than Options Outstanding:
Balance (in shares)				1,004,000
Balance (in dollars per share)				$ 12.74
Granted (in shares)				304,000
Granted (in dollars per share)				$ 15.52
Vested (in shares)	[1]			(322,000)
Vested (in dollars per share)	[1]			$ 13.54
Cancelled or forfeited (in shares)				0
Cancelled or forfeited (in dollars per share)				$ 0
Balance (in shares)		986,000		986,000
Balance (in dollars per share)		$ 13.34		$ 13.34
Expected to vest (in shares)		986,000		986,000
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized		$ 0	$ 0	$ 163	$ 117
Unrecognized Compensation Cost		$ 0		$ 0
Weighted Average Remaining Amortization Periods				0 years
Equity Awards Other Than Options Outstanding:
Balance (in shares)				145,000
Granted (in shares)				10,000
Granted (in dollars per share)				$ 16.25
Dividend equivalents issued				2,000
Balance (in shares)		157,000		157,000
Scheduled to Vest January 1, 2018 [Member] | Performance Vested Restricted Stock Units [Member]
Equity Awards Other Than Options Outstanding:
Balance (in shares)		202,000		202,000
Expected to vest (in shares)		202,000		202,000
Not expected to vest (in shares)		0		0
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

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