Income Taxes (Details) - USD ($)	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax provision	$ 518,000	$ 1,900,000
Unrecognized tax benefits that could significantly change during the next twelve months	1,700,000
Total potential decrease in UTB	1,700,000
Tax credit carryforward, amount			$ 105,900,000
Maximum
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits, associated interest and penalties that could significantly change within the next twelve months	$ 100,000
U.S. Federal
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Statutory income tax rate	35.00%
Bermuda
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income tax provision	$ 0
Statutory income tax rate	0.00%
Internal Revenue Service (IRS)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards			367,000,000
Tax credit carryforward, amount			49,200,000
State and Local Jurisdiction
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Operating loss carryforwards			193,300,000
Tax credit carryforward, amount			56,700,000
Other Long-term Liabilities
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Uncertain tax positions	$ 28,000,000		29,600,000
No Expiration Date
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Tax credit carryforward, amount			$ 55,500,000