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
	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