|
Marketable Securities (Available for Sale Securities Measured at Estimated Fair Value on Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
|
Jun. 28, 2014
|
Dec. 28, 2013
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
$ 1,617,004 |
$ 1,651,968 |
|
Mortgage-Backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
380,211 |
437,330 |
|
Obligations of States and Political Subdivisions [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
600,823 |
647,354 |
|
Corporate Bond Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
517,867 |
457,148 |
|
Common Stocks [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
30,850 |
29,854 |
|
Other securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
87,253 |
80,282 |
|
Level 1 [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
30,850 |
29,854 |
|
Level 1 [Member] | Mortgage-Backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 1 [Member] | Obligations of States and Political Subdivisions [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 1 [Member] | Corporate Bond Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 1 [Member] | Common Stocks [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
30,850 |
29,854 |
|
Level 1 [Member] | Other securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 2 [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
1,586,154 |
1,622,114 |
|
Level 2 [Member] | Mortgage-Backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
380,211 |
437,330 |
|
Level 2 [Member] | Obligations of States and Political Subdivisions [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
600,823 |
647,354 |
|
Level 2 [Member] | Corporate Bond Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
517,867 |
457,148 |
|
Level 2 [Member] | Common Stocks [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 2 [Member] | Other securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
87,253 |
80,282 |
|
Level 3 [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 3 [Member] | Mortgage-Backed Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 3 [Member] | Obligations of States and Political Subdivisions [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 3 [Member] | Corporate Bond Securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 3 [Member] | Common Stocks [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
0 |
0 |
|
Level 3 [Member] | Other securities [Member]
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Available-for-sale Securities, Total |
$ 0 |
$ 0 |