XML 57 R44.htm IDEA: XBRL DOCUMENT v3.7.0.1
Organization and Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Carrying Amount    
Summary of the fair value and carrying value of debt    
Total debt $ 1,442,652 $ 1,441,724
Carrying Amount | Fixed rate debt    
Summary of the fair value and carrying value of debt    
Total debt 685,152 683,577
Carrying Amount | Floating rate debt    
Summary of the fair value and carrying value of debt    
Total debt 757,500 758,147
Fair Value    
Summary of the fair value and carrying value of debt    
Total debt 1,458,000 1,445,000
Fair Value | Fixed rate debt    
Summary of the fair value and carrying value of debt    
Total debt 699,000 686,000
Fair Value | Floating rate debt    
Summary of the fair value and carrying value of debt    
Total debt $ 759,000 $ 759,000