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Notes Payable (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Oct. 04, 2011 Bank Of America [Member] | Dec. 31, 2013 Bank Of America [Member] | Oct. 04, 2011 Union Bank [Member] | Dec. 31, 2013 Union Bank [Member] | Dec. 31, 2012 Union Bank [Member] | Dec. 31, 2013 AIS [Member] | Jul. 02, 2013 Revolving Credit Facility [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Jul. 02, 2013 Revolving Credit Facility [Member] Minimum [Member] | Jul. 02, 2013 Revolving Credit Facility [Member] Maximum [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] LIBOR [Member] | Jul. 02, 2013 Revolving Credit Facility [Member] LIBOR [Member] Minimum [Member] | Jul. 02, 2013 Revolving Credit Facility [Member] LIBOR [Member] Maximum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan maximum borrowing capacity | $ 200,000,000 |  |  |  |  | $ 18,000,000 | $ 20,000,000 |  |  | $ 20,000,000 |  | $ 200,000,000 |  |  |  |  |  |
Revolving credit facility term |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.40% |  | 0.40% |  |  |  |  |  |  | 1.125% | 1.125% | 1.625%
Debt to total capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15 | 0.25 |  | 0.15 | 0.25
Commitment fee on undrawn portion of facility |  |  |  |  |  |  |  |  |  |  |  |  | 0.125% | 0.125% | 0.225% |  |  |
Credit facility amount | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Secured Debt, Other |  |  |  |  |  |  |  |  |  |  | 120,000,000 |  |  |  |  |  |  |
Advance rate used to calculate collateral requirement |  |  |  | 75.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Loan expiration date |  |  |  |  |  | Mar. 01, 2013 |  | Jan. 02, 2015 |  |  |  |  |  |  |  |  |  |
Senior notes retired | 0 | 0 | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note payable at maturity date | $ 190,000,000 | $ 140,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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