Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-18-152850-index-headers.html | 2018-05-04 16:28:44 | |
| 0001193125-18-152850-index.html | 2018-05-04 16:28:44 | |
| 0001193125-18-152850.txt | 2018-05-04 16:28:44 | |
 0001193125-18-152850-xbrl.zip | 66195 | 2018-05-04 16:28:44 |
| d547152d10q.htm | 248965 | 2018-05-04 16:28:44 |
| d547152dex311.htm | 9417 | 2018-05-04 16:28:44 |
| d547152dex312.htm | 9428 | 2018-05-04 16:28:44 |
| d547152dex32.htm | 4032 | 2018-05-04 16:28:44 |
| FilingSummary.xml | 22001 | 2018-05-04 16:28:44 |
| Financial_Report.xlsx | 37274 | 2018-05-04 16:28:44 |
| md-20180331.xml | 262160 | 2018-05-04 16:28:44 |
| md-20180331.xsd | 30897 | 2018-05-04 16:28:44 |
| md-20180331_cal.xml | 58479 | 2018-05-04 16:28:44 |
| md-20180331_def.xml | 64044 | 2018-05-04 16:28:44 |
| md-20180331_lab.xml | 242377 | 2018-05-04 16:28:44 |
| md-20180331_pre.xml | 152902 | 2018-05-04 16:28:44 |
| R1.htm | 21921 | 2018-05-04 16:28:44 |
| R10.htm | 11228 | 2018-05-04 16:28:44 |
| R11.htm | 14289 | 2018-05-04 16:28:44 |
| R12.htm | 12903 | 2018-05-04 16:28:44 |
| R13.htm | 11229 | 2018-05-04 16:28:44 |
| R14.htm | 9203 | 2018-05-04 16:28:44 |
| R15.htm | 9386 | 2018-05-04 16:28:44 |
| R16.htm | 20803 | 2018-05-04 16:28:44 |
| R17.htm | 26461 | 2018-05-04 16:28:44 |
| R18.htm | 11886 | 2018-05-04 16:28:44 |
| R19.htm | 10660 | 2018-05-04 16:28:44 |
| R2.htm | 77616 | 2018-05-04 16:28:44 |
| R20.htm | 6786 | 2018-05-04 16:28:44 |
| R21.htm | 13945 | 2018-05-04 16:28:44 |
| R22.htm | 14632 | 2018-05-04 16:28:44 |
| R23.htm | 10171 | 2018-05-04 16:28:44 |
| R24.htm | 15221 | 2018-05-04 16:28:44 |
| R25.htm | 9750 | 2018-05-04 16:28:44 |
| R26.htm | 10817 | 2018-05-04 16:28:44 |
| R27.htm | 13247 | 2018-05-04 16:28:44 |
| R28.htm | 43121 | 2018-05-04 16:28:44 |
| R29.htm | 20269 | 2018-05-04 16:28:44 |
| R3.htm | 16915 | 2018-05-04 16:28:44 |
| R30.htm | 4062 | 2018-05-04 16:28:44 |
| R31.htm | 12155 | 2018-05-04 16:28:44 |
| R32.htm | 38640 | 2018-05-04 16:28:44 |
| R4.htm | 49691 | 2018-05-04 16:28:44 |
| R5.htm | 79311 | 2018-05-04 16:28:44 |
| R6.htm | 12045 | 2018-05-04 16:28:44 |
| R7.htm | 23099 | 2018-05-04 16:28:44 |
| R8.htm | 11264 | 2018-05-04 16:28:44 |
| R9.htm | 28662 | 2018-05-04 16:28:44 |
| report.css | 2767 | 2018-05-04 16:28:44 |
| Show.js | 1410 | 2018-05-04 16:28:44 |