Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Oct. 01, 2016 | Jan. 02, 2016 |
Assets | | |
Asset measured at, fair value | $ 32,560 | |
Recurring [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 34,508 | $ 46,207 |
Assets measured at fair value, Unrealized gains | 75 | 37 |
Assets measured at fair value, Unrealized losses | (725) | (2,070) |
Asset measured at, fair value | 33,858 | 44,174 |
Recurring [Member] | Level 1 [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 1,483 | 3,929 |
Assets measured at fair value, Unrealized gains | 0 | 29 |
Assets measured at fair value, Unrealized losses | (185) | (274) |
Asset measured at, fair value | 1,298 | 3,684 |
Recurring [Member] | Level 1 [Member] | Equity securities [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 0 | 1,318 |
Assets measured at fair value, Unrealized gains | 0 | 28 |
Assets measured at fair value, Unrealized losses | 0 | (36) |
Asset measured at, fair value | 0 | 1,310 |
Recurring [Member] | Level 1 [Member] | Mutual funds [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 1,483 | 2,611 |
Assets measured at fair value, Unrealized gains | 0 | 1 |
Assets measured at fair value, Unrealized losses | (185) | (238) |
Asset measured at, fair value | 1,298 | 2,374 |
Recurring [Member] | Level 2 [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 33,025 | 42,278 |
Assets measured at fair value, Unrealized gains | 75 | 8 |
Assets measured at fair value, Unrealized losses | (540) | (1,796) |
Asset measured at, fair value | 32,560 | 40,490 |
Liabilities | | |
Liabilities Measured at Fair Value Adjusted Cost | 26 | 17 |
Liabilities measured at fair value, Unrealized gains | 0 | 0 |
Liabilities measured at fair value, Unrealized losses | 0 | 0 |
Liabilities measured at fair value | 26 | 17 |
Recurring [Member] | Level 2 [Member] | Phantom Share Units (PSUs) [Member] | | |
Liabilities | | |
Liabilities Measured at Fair Value Adjusted Cost | 26 | 17 |
Liabilities measured at fair value, Unrealized gains | 0 | 0 |
Liabilities measured at fair value, Unrealized losses | 0 | 0 |
Liabilities measured at fair value | 26 | 17 |
Recurring [Member] | Level 2 [Member] | Corporate fixed income [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 26,613 | 35,936 |
Assets measured at fair value, Unrealized gains | 75 | 8 |
Assets measured at fair value, Unrealized losses | (478) | (1,682) |
Asset measured at, fair value | 26,210 | 34,262 |
Recurring [Member] | Level 2 [Member] | Certificates of deposit [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 0 | 2,947 |
Assets measured at fair value, Unrealized gains | 0 | 0 |
Assets measured at fair value, Unrealized losses | 0 | 0 |
Asset measured at, fair value | 0 | 2,947 |
Recurring [Member] | Level 2 [Member] | Municipal bonds [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 6,412 | 2,897 |
Assets measured at fair value, Unrealized gains | 0 | 0 |
Assets measured at fair value, Unrealized losses | (62) | (94) |
Asset measured at, fair value | 6,350 | 2,803 |
Recurring [Member] | Level 2 [Member] | Asset backed securities [Member] | | |
Assets | | |
Assets measured at fair value, Adjusted cost | 0 | 498 |
Assets measured at fair value, Unrealized gains | 0 | 0 |
Assets measured at fair value, Unrealized losses | 0 | (20) |
Asset measured at, fair value | $ 0 | $ 478 |