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Secured Debt and Unsecured Debt (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Aggregate maturities of debt    
2013 $ 244,111  
2014 275,526  
2015 511,065  
2016 315,496  
2017 620,664  
Long-Term Debt, Maturities, Repayments of Principal in Year Six 350,000  
Long-Term Debt, Maturities, Repayments of Principal in Year Seven 400,000  
Long-Term Debt, Maturities, Repayment of Principal in Year Eight 96,409  
Long-Term Debt, Maturities, Repayment of Principal in Year Nine 315,644  
Long-Term Debt, Maturities, Repayments of Principal in Year Ten 427,600  
Long-Term Debt, Maturities, Repayments of Principal after Year Ten 27,000  
Long-term Debt, Gross 3,583,515  
Debt Instrument, Unamortized Discount (Premium), Net (12,720)  
Total Debt 3,570,795 $ 3,565,299
Secured Debt [Member]    
Aggregate maturities of debt    
2013 149,058  
2014 275,526  
2015 211,065  
2016 315,496  
2017 170,664  
Long-Term Debt, Maturities, Repayments of Principal in Year Six 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Seven 0  
Long-Term Debt, Maturities, Repayment of Principal in Year Eight 96,409  
Long-Term Debt, Maturities, Repayment of Principal in Year Nine 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Ten 127,600  
Long-Term Debt, Maturities, Repayments of Principal after Year Ten 27,000  
Long-term Debt, Gross 1,372,818  
Debt Instrument, Unamortized Discount (Premium), Net 4,127  
Total Debt 1,376,945  
Secured Debt [Member] | Fixed Rate Debt    
Aggregate maturities of debt    
2013 149,058  
2014 179,189  
2015 73,096  
2016 247,796  
2017 170,664  
Long-Term Debt, Maturities, Repayments of Principal in Year Six 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Seven 0  
Long-Term Debt, Maturities, Repayment of Principal in Year Eight 0  
Long-Term Debt, Maturities, Repayment of Principal in Year Nine 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Ten 127,600  
Long-Term Debt, Maturities, Repayments of Principal after Year Ten 0  
Long-term Debt, Gross 947,403  
Debt Instrument, Unamortized Discount (Premium), Net 5,398  
Total Debt 952,801  
Secured Debt [Member] | Variable Rate Debt    
Aggregate maturities of debt    
2013 0  
2014 96,337  
2015 137,969  
2016 67,700  
2017 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Six 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Seven 0  
Long-Term Debt, Maturities, Repayment of Principal in Year Eight 96,409  
Long-Term Debt, Maturities, Repayment of Principal in Year Nine 0  
Long-Term Debt, Maturities, Repayments of Principal in Year Ten 0  
Long-Term Debt, Maturities, Repayments of Principal after Year Ten 27,000  
Long-term Debt, Gross 425,415  
Debt Instrument, Unamortized Discount (Premium), Net (1,271)  
Total Debt 424,144  
Unsecured Debt [Member]    
Aggregate maturities of debt    
2013 95,053  
2014 0  
2015 300,000  
2016 0  
2017 450,000  
Long-Term Debt, Maturities, Repayments of Principal in Year Six 350,000  
Long-Term Debt, Maturities, Repayments of Principal in Year Seven 400,000  
Long-Term Debt, Maturities, Repayment of Principal in Year Eight 0  
Long-Term Debt, Maturities, Repayment of Principal in Year Nine 315,644  
Long-Term Debt, Maturities, Repayments of Principal in Year Ten 300,000  
Long-Term Debt, Maturities, Repayments of Principal after Year Ten 0  
Long-term Debt, Gross 2,210,697  
Debt Instrument, Unamortized Discount (Premium), Net (16,847)  
Total Debt $ 2,193,850