dashes - Punctuation following an interruption with a dash


I am not sure what the correct punctuation to use when ending a clause that was introduced with a dash when the next character in the main sentence is a punctuation mark.


Take the following contrived example:



He was walking down the street when he saw something quite surprising - being easily surprised was one of his characteristics - : a blue car.



Is the punctuation correct in this situation? Even in terms of spaces around the punctuation marks?


The same question applies if the interruption appears at the end of a question. For instance:



What on earth could he be expecting from her - she had long ago ceased to believe he cared for her - ?





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