Fair Value of Financial Instruments (Details) - USD ($) | Apr. 02, 2016 | Jan. 02, 2016 |
Assets | | |
Asset measured at, fair value | $ 42,028,000 | |
Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 43,724,000 | $ 46,207,000 |
Assets measured at fair value, Unrealized gains | 71,000 | 37,000 |
Assets measured at fair value, Unrealized losses | (1,767,000) | (2,070,000) |
Asset measured at, fair value | 42,028,000 | 44,174,000 |
Level 1 [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 3,456,000 | 3,929,000 |
Assets measured at fair value, Unrealized gains | 27,000 | 29,000 |
Assets measured at fair value, Unrealized losses | (323,000) | (274,000) |
Asset measured at, fair value | 3,160,000 | 3,684,000 |
Level 1 [Member] | Equity securities [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 1,005,000 | 1,318,000 |
Assets measured at fair value, Unrealized gains | 22,000 | 28,000 |
Assets measured at fair value, Unrealized losses | (42,000) | (36,000) |
Asset measured at, fair value | 985,000 | 1,310,000 |
Level 1 [Member] | Mutual funds [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 2,451,000 | 2,611,000 |
Assets measured at fair value, Unrealized gains | 5,000 | 1,000 |
Assets measured at fair value, Unrealized losses | (281,000) | (238,000) |
Asset measured at, fair value | 2,175,000 | 2,374,000 |
Level 2 [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 40,268,000 | 42,278,000 |
Assets measured at fair value, Unrealized gains | 44,000 | 8,000 |
Assets measured at fair value, Unrealized losses | (1,444,000) | (1,796,000) |
Asset measured at, fair value | 38,868,000 | 40,490,000 |
Liabilities | | |
Liabilities measured at fair value, Unrealized gains | 0 | 0 |
Liabilities measured at fair value, Unrealized losses | 0 | 0 |
Liabilities measured at fair value | 21,000 | 17,000 |
Convertible Debt, Fair Value Disclosures | 21,000 | 17,000 |
Level 2 [Member] | Phantom Share Units (PSUs) [Member] | Recurring [Member] | | |
Assets | | |
Liabilities Measured at Fair Value Adjusted Cost | 21,000 | 17,000 |
Liabilities | | |
Liabilities measured at fair value, Unrealized gains | 0 | 0 |
Liabilities measured at fair value, Unrealized losses | 0 | 0 |
Liabilities measured at fair value | 21,000 | 17,000 |
Level 2 [Member] | Corporate fixed income [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 35,459,000 | 35,936,000 |
Assets measured at fair value, Unrealized gains | 39,000 | 8,000 |
Assets measured at fair value, Unrealized losses | (1,332,000) | (1,682,000) |
Asset measured at, fair value | 34,166,000 | 34,262,000 |
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 2,912,000 | 2,897,000 |
Assets measured at fair value, Unrealized gains | 1,000 | 0 |
Assets measured at fair value, Unrealized losses | (109,000) | (94,000) |
Asset measured at, fair value | 2,804,000 | 2,803,000 |
Level 2 [Member] | Certificates of deposit [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 1,422,000 | 2,947,000 |
Assets measured at fair value, Unrealized gains | 0 | 0 |
Assets measured at fair value, Unrealized losses | 0 | 0 |
Asset measured at, fair value | 1,422,000 | 2,947,000 |
Level 2 [Member] | Asset backed securities [Member] | Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 475,000 | 498,000 |
Assets measured at fair value, Unrealized gains | 4,000 | 0 |
Assets measured at fair value, Unrealized losses | (3,000) | (20,000) |
Asset measured at, fair value | $ 476,000 | $ 478,000 |