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Fair value measurements Book and Fair Values (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
“Available-for-sale” securities $ 30,817 $ 4,469
Interest rate swap agreements 287  
Book Value
   
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
“Available-for-sale” securities 30,817 4,469
Interest rate swap agreements 958 2,870
Interest rate swap agreements 1,245 6,191
Secured notes payable 636,825 708,831
Unsecured senior line of credit 142,000 204,000
Fair Value
   
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
“Available-for-sale” securities 30,817 4,469
Interest rate swap agreements 958 2,870
Interest rate swap agreements 1,245 6,191
Secured notes payable 686,388 736,772
Unsecured senior line of credit 141,881 193,714
Senior Notes [Member] | Book Value
   
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Debt Instrument, Fair Value Disclosure 1,747,290 1,048,230
Senior Notes [Member] | Fair Value
   
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Debt Instrument, Fair Value Disclosure 1,775,990 1,043,125
Unsecured Bank Term Loan 2016 | Book Value
   
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Debt Instrument, Fair Value Disclosure 975,000 1,100,000
Unsecured Bank Term Loan 2016 | Fair Value
   
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Debt Instrument, Fair Value Disclosure $ 974,424 $ 1,099,897