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Notes Payable (Narrative) (Details) (USD $) | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2010 Parent Company [Member] | Oct. 04, 2011 Bank Of America [Member] | Oct. 04, 2011 Union Bank [Member] | Dec. 31, 2011 Senior Notes [Member] | Dec. 31, 2009 AIS [Member] | Dec. 31, 2010 AIS [Member] | Dec. 31, 2009 AIS [Member] Minimum [Member] | Dec. 31, 2009 AIS [Member] Maximum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition cost |  |  |  |  |  |  |  | $ 120,000,000 |  |  |
Credit facility maturity date range, start |  |  |  |  |  |  |  | January 1, 2012 |  |  |
Credit facility maturity date range, end |  |  |  |  |  |  |  | January 2, 2015 |  |  |
Loan maximum borrowing capacity |  |  |  |  | 18,000,000 | 20,000,000 |  | 120,000,000 |  |  |
Advance rate used to calculate collateral requirement |  |  |  |  |  |  |  |  |  | 75.00% | 100.00%
Loan expiration date |  |  |  |  | March 1, 2013 | January 2, 2015 |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 50.00% | 40.00% |  |  | 40.00% |  |
Senior notes retired | 125,000,000 | 0 | 0 |  |  |  | 125,000,000 |  |  |  |
Unsecured senior notes interest rate |  |  |  |  |  |  | 7.25% |  |  |  |
Note payable at maturity date | $ 140,000,000 | $ 267,210,000 |  | $ 129,210,000 |  |  | $ 140,000,000 |  |  |  |
Notes maturity date |  |  |  |  |  |  | Aug. 15, 2011 |  |  |  |

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