XML 18 R24.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Income Taxes (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2013
Income Tax Disclosure [Abstract] |
Income Taxes Changes |
(in thousands) | Three months ended September 30, | Nine months ended September 30,
| 2013 | 2012 | 2013 | 2012
Income tax benefit | $ 47 | $ 436 | $ 23 | $ 432
Deferred tax benefit (expense) on unrealized losses on marketable equity securities in other comprehensive income | $ (47) | $(576) | $ 928 | $ 964

X
- Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | XPL_ChangesInIncomeTaxesTableTextBlock
Namespace Prefix: | XPL_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration