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Debt (Line of Credit) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
acre
Dec. 21, 2011
Jun. 27, 2011
acre
Feb. 03, 2011
Line of Credit Facility [Line Items]        
Amout Available to Increase Borrowing Capacity $ 100,000,000      
Remaining Borrowing Capacity 148,000,000      
Minimum Liquidity Requirement, Covenant 60,000,000      
Minimum Liquidity Requirement, Actual 218,800,000      
Line of Credit [Member]
       
Line of Credit Facility [Line Items]        
Maximum Borrowing Capacity 150,000,000     250,000,000
Amount Outstanding 0      
Additional Applicable Rate Added to Base Rate, Minimum 3.00%      
Additional Applicable Rate Added to Base Rate, Maximum 4.00%      
Additional Applicable Rate Added to Base Rate, At End of Period 3.75%      
Unused Capacity, Commitment Fee Percentage 0.50%      
Minimum Collateral Coverage Ratio, Covenant 3.00     2.25
Minimum Collateral Coverage Ratio, Actual       3.27
Maximum Funded Indebtedness to Capitalization Ratio, Covenant 0.700     0.600
Collateral, Acres 351,900   640,900  
Maximum Funded Indebtedness to Capitalization Ratio, Actual 0.564      
Minimum Interest Coverage Ratio, Covenant 2.00 3.00    
Minimum Interest Coverage Ratio, Actual   3.95    
Letter of Credit [Member]
       
Line of Credit Facility [Line Items]        
Maximum Borrowing Capacity 35,000,000      
Amount Outstanding 2,000,000      
Swing Line Loan [Member]
       
Line of Credit Facility [Line Items]        
Maximum Borrowing Capacity $ 20,000,000