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Notes Payable (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Oct. 04, 2011 Bank Of America [Member] | Oct. 04, 2011 Union Bank [Member] | Dec. 31, 2012 Union Bank [Member] | Dec. 31, 2011 Union Bank [Member] | Dec. 31, 2011 Senior Notes [Member] | Dec. 31, 2012 Senior Notes [Member] | Aug. 04, 2011 AIS [Member] | Dec. 31, 2012 AIS [Member] | Dec. 31, 2011 AIS [Member] | Dec. 31, 2009 AIS [Member] Minimum [Member] | Dec. 31, 2009 AIS [Member] Maximum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan maximum borrowing capacity |  |  |  | $ 18,000,000 |  | $ 20,000,000 | $ 20,000,000 |  |  |  | $ 120,000,000 | $ 120,000,000 |  |
Advance rate used to calculate collateral requirement |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% | 100.00%
Credit facility maturity date range, start |  |  |  |  |  |  |  |  |  | Jan. 01, 2012 |  |  |  |
Credit facility maturity date range, end |  |  |  |  |  |  |  |  |  | Jan. 02, 2015 |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% | 0.40% |  |  |  |  | 0.40% |  |  |  |
Loan expiration date |  |  |  | Mar. 01, 2013 | Jan. 02, 2015 |  |  |  |  |  |  |  |  |
Senior notes retired | 0 | 125,000,000 | 0 |  |  |  |  | 125,000,000 |  |  |  |  |  |
Unsecured senior notes interest rate |  |  |  |  |  |  |  | 7.25% |  |  |  |  |  |
Notes maturity date |  |  |  |  |  |  |  | Aug. 15, 2011 |  |  |  |  |  |
Note payable at maturity date | $ 140,000,000 | $ 140,000,000 |  |  |  |  |  |  | $ 140,000,000 |  |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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