Notes Payable (NAB Australian Corporate Term Loan) (Narrative) (Details)			0 Months Ended		12 Months Ended				1 Months Ended										12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 24, 2011 BOSI Australia Corporate Credit Facility [Member] USD ($)	Jun. 24, 2011 BOSI Australia Corporate Credit Facility [Member] AUD	Dec. 31, 2013 NAB Australian Corporate Credit Facility [Member] USD ($)	Dec. 31, 2013 NAB Australian Corporate Credit Facility [Member] AUD	Jun. 24, 2011 NAB Australian Corporate Credit Facility [Member] USD ($)	Jun. 24, 2011 NAB Australian Corporate Credit Facility [Member] AUD	Dec. 31, 2012 NAB Australian Corporate Term Loan [Member] USD ($)	Dec. 31, 2012 NAB Australian Corporate Term Loan [Member] AUD	Dec. 31, 2013 NAB Australian Corporate Term Loan [Member] USD ($)	Dec. 31, 2013 NAB Australian Corporate Term Loan [Member] AUD	Jun. 24, 2011 NAB Australian Corporate Term Loan [Member] USD ($)	Jun. 24, 2011 NAB Australian Corporate Term Loan [Member] AUD	Jun. 24, 2011 NAB Australian Corporate Line Of Credit [Member] USD ($)	Jun. 24, 2011 NAB Australian Corporate Line Of Credit [Member] AUD	Dec. 31, 2013 NAB Australian Corporate Revolver [Member] USD ($)	Dec. 31, 2013 NAB Australian Corporate Revolver [Member] AUD	Dec. 31, 2013 NAB Guarantee Facility [Member] USD ($)	Dec. 31, 2013 NAB Guarantee Facility [Member] AUD	Dec. 31, 2013 Minimum [Member] NAB Australian Corporate Credit Facility [Member] USD ($)	Dec. 31, 2013 Minimum [Member] NAB Australian Corporate Credit Facility [Member] AUD	Dec. 31, 2013 Maximum [Member] NAB Australian Corporate Credit Facility [Member] USD ($)	Dec. 31, 2013 Maximum [Member] NAB Australian Corporate Credit Facility [Member] AUD
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 115,800,000	110,000,000			$ 110,500,000	105,000,000					$ 94,700,000	90,000,000	$ 9,500,000	9,000,000	$ 4,500,000	5,000,000	$ 8,900,000	10,000,000
Repayment of debt			1,600,000	1,500,000					6,300,000	6,000,000
Line of credit facility, amount outstanding			105,800,000	100,500,000
Note payable	168,460,000	196,597,000							75,349,000		56,699,000	63,500,000
Line of credit facility, amount transferred																			4,500,000	5,000,000
Line of credit facility, term					3 years	3 years
Spread on variable interest rate																					2.15%	2.15%	2.90%	2.90%
Annual principal payment																					6,300,000	7,000,000	8,000,000	9,000,000
Line of credit facility, maximum amount transferable outside of Australia					$ 3,600,000	4,000,000
Interest rate swap term					5 years	5 years
Percentage of variable interest debt converted to fixed rate					100.00%	100.00%
Swap contract rate					5.50%	5.50%