Share-Based Compensation Performance Shares (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Share-based Compensation, Performance Shares, Nonvested, Number of Shares [Roll Forward]
Weighted average grant date fair value, dividend equivalent units issued	$ 0.00
Performance Condition Award [Member]
Share-based Compensation, Performance Shares, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning of period	799
Granted	165
Dividend equivalent units issued	11
Vested	(371)
Forfeited	0
Non-vested, end of period	604	799
Weighted average grant date fair value, non-vested, beginning of period	$ 9.89
Weighted average grant date fair value, granted	13.87
Weighted average grant date fair value, dividend equivalent units issued	0.00
Weighted average grant date fair value, vested	9.73
Weighted average grant date fair value, forfeited	0.00
Weighted average grant date fair value, non-vested, end of period	$ 11.13	$ 9.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Incremental Above Target	37
Total fair value, vested in period	$ 5,666	$ 5,954	$ 1,156
Market Condition Performance Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.44%	0.82%	1.00%
Expected life in years	3 years	3 years	3 years
Expected volatility	25.06%	27.03%	25.56%
Expected dividend yield	0.00%	0.00%	0.00%
Share-based Compensation, Performance Shares, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning of period	352
Granted	134
Dividend equivalent units issued	12
Vested	0
Forfeited	0
Non-vested, end of period	498	352
Weighted average grant date fair value, non-vested, beginning of period	$ 12.17
Weighted average grant date fair value, granted	16.81
Weighted average grant date fair value, dividend equivalent units issued	0.00
Weighted average grant date fair value, vested	0.00
Weighted average grant date fair value, forfeited	0.00
Weighted average grant date fair value, non-vested, end of period	$ 13.49	$ 12.17
Total fair value, vested in period	$ 0	$ 0	$ 10,073
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares Vesting Range, Percentage of Target	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares Vesting Range, Percentage of Target	200.00%