Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-12-114921-index-headers.html | 2012-03-14 16:27:04 | |
| 0001193125-12-114921-index.html | 2012-03-14 16:27:04 | |
| 0001193125-12-114921.txt | 2012-03-14 16:27:04 | |
 0001193125-12-114921-xbrl.zip | 88665 | 2012-03-14 16:27:04 |
| d257864d10k.htm | 1794308 | 2012-03-14 16:27:04 |
| d257864dex121.htm | 33050 | 2012-03-14 16:27:04 |
| d257864dex211.htm | 15901 | 2012-03-14 16:27:04 |
| d257864dex231.htm | 1684 | 2012-03-14 16:27:04 |
| d257864dex311.htm | 10185 | 2012-03-14 16:27:04 |
| d257864dex312.htm | 10455 | 2012-03-14 16:27:04 |
| d257864dex321.htm | 4435 | 2012-03-14 16:27:04 |
| d257864dex322.htm | 4576 | 2012-03-14 16:27:04 |
| FilingSummary.xml | 14240 | 2012-03-14 16:27:04 |
| Financial_Report.xls | 703638 | 2012-03-14 16:27:04 |
 g257864g06a36.jpg | 57199 | 2012-03-14 16:27:04 |
 g257864g22b82.jpg | 39002 | 2012-03-14 16:27:04 |
| musa-20111231.xml | 859651 | 2012-03-14 16:27:04 |
| musa-20111231.xsd | 17687 | 2012-03-14 16:27:04 |
| musa-20111231_cal.xml | 47517 | 2012-03-14 16:27:04 |
| musa-20111231_def.xml | 121967 | 2012-03-14 16:27:04 |
| musa-20111231_lab.xml | 135318 | 2012-03-14 16:27:04 |
| musa-20111231_pre.xml | 146905 | 2012-03-14 16:27:04 |
| R1.htm | 37570 | 2012-03-14 16:27:04 |
| R10.htm | 17789 | 2012-03-14 16:27:04 |
| R11.htm | 19657 | 2012-03-14 16:27:04 |
| R12.htm | 75700 | 2012-03-14 16:27:04 |
| R13.htm | 36943 | 2012-03-14 16:27:04 |
| R14.htm | 10530 | 2012-03-14 16:27:04 |
| R15.htm | 17607 | 2012-03-14 16:27:04 |
| R16.htm | 57175 | 2012-03-14 16:27:04 |
| R17.htm | 77861 | 2012-03-14 16:27:04 |
| R18.htm | 16342 | 2012-03-14 16:27:04 |
| R19.htm | 81153 | 2012-03-14 16:27:04 |
| R2.htm | 115904 | 2012-03-14 16:27:04 |
| R20.htm | 52541 | 2012-03-14 16:27:04 |
| R21.htm | 5247 | 2012-03-14 16:27:04 |
| R22.htm | 13918 | 2012-03-14 16:27:04 |
| R23.htm | 8778 | 2012-03-14 16:27:04 |
| R24.htm | 17016 | 2012-03-14 16:27:04 |
| R25.htm | 26768 | 2012-03-14 16:27:04 |
| R26.htm | 4919 | 2012-03-14 16:27:04 |
| R27.htm | 89414 | 2012-03-14 16:27:04 |
| R3.htm | 31089 | 2012-03-14 16:27:04 |
| R4.htm | 81383 | 2012-03-14 16:27:04 |
| R5.htm | 65458 | 2012-03-14 16:27:04 |
| R6.htm | 3613 | 2012-03-14 16:27:04 |
| R7.htm | 151503 | 2012-03-14 16:27:04 |
| R8.htm | 56060 | 2012-03-14 16:27:04 |
| R9.htm | 50909 | 2012-03-14 16:27:04 |
| report.css | 2721 | 2012-03-14 16:27:04 |
| Show.js | 6423 | 2012-03-14 16:27:04 |