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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details)
$ in Thousands
3 Months Ended 6 Months Ended 36 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
lease
Jun. 30, 2016
USD ($)
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net cash provided by (used in) operating activities         $ 205,327 $ 214,161  
Net cash provided by (used in) financing activities         $ (206,346) $ (258,279)  
Income earned from leasing as a percentage of revenue             95.00%
Number of ground lease arrangements as a lessee | lease         11    
Future contractual lease payments         $ 15,346    
Accounting Standards Update 2016-09              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net cash provided by (used in) operating activities $ 129,014 $ 125,395 $ 128,471 $ 85,979      
Net cash provided by (used in) financing activities (137,408) (89,378) (162,861) (95,707)      
Accounting Standards Update 2016-09 | Scenario, Previously Reported              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net cash provided by (used in) operating activities 128,954 125,464 128,384 85,777      
Net cash provided by (used in) financing activities (137,348) (89,447) (162,774) (95,505)      
Accounting Standards Update 2016-09 | Restatement Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net cash provided by (used in) operating activities 60 (69) 87 202      
Net cash provided by (used in) financing activities $ (60) $ 69 $ (87) $ (202)