XML 73 R52.htm IDEA: XBRL DOCUMENT v3.6.0.2
Unsecured Debt - Future Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total Debt $ 2,191,481 $ 2,215,077
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
2017 340,000  
2018 0  
2019 75,000  
2020 0  
2021 500,000  
Thereafter 2,350,000  
Total Debt $ 3,265,000