Long-Term Debt (Detail Textuals 2)		12 Months Ended
	Jan. 04, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Threshold limit of ratio of debt to earnings before interest taxes depreciation and amortization		no more than 2.5 to 1
Debt-to-EBITDA ratio (in times)		2.5
Threshold limit of ratio of earnings before interest taxes depreciation and amortization to interest expenses		no less than 2 to 1
EBITDA to interest expense ratio (in times)		2
Outstanding borrowings under the facility
Available borrowing under the facility		$ 95,700,000
Letter of credit subfacility
Line of Credit Facility [Line Items]
Outstanding borrowings under the facility		29,300,000
Amount of credit facility		$ 50,000,000
Revolving credit facility
Line of Credit Facility [Line Items]
Outstanding borrowings under the facility			$ 224,500,000
Term of line of credit facility		5 years
Amount of credit facility		$ 125,000,000	$ 350,000,000
Revolving credit facility | Subsequent Event
Line of Credit Facility [Line Items]
Available borrowing under the facility	$ 125,000,000
Uncommitted letter of credit facility | Subsequent Event
Line of Credit Facility [Line Items]
Term of line of credit facility	1 year
Amount of credit facility	$ 35,000,000
Percentage of fee on letter of credit	0.75%