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Noncontrolling Interests Redeemable Noncontrolling Interests Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                      
Redeemable Noncontrolling Interests, Equity, Carrying Amount, Beginning of Period       $ 17,461         $ 17,461    
Nonredeemable Noncontrolling Interest, Beginning of Period       5,186         5,186    
Net income attributable to noncontrolling interests $ 545 $ 924 $ 968 1,050 $ 1,278 $ 1,074 $ 1,150 $ 966 3,487 $ 4,468 $ 4,157
Redeemable Noncontrolling Interests, Equity, Carrying Amount, End of Period 2,526       17,461       2,526 17,461  
Nonredeemable Noncontrolling Interest, Beginning of Period 0       5,186       0 5,186  
Anchor                      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                      
Nonredeemable Noncontrolling Interest, Beginning of Period               2,900   2,900  
Nonredeemable Noncontrolling Interest, Beginning of Period                     2,900
Redeemable noncontrolling interests                      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                      
Redeemable Noncontrolling Interests, Equity, Carrying Amount, Beginning of Period       17,461       16,972 17,461 16,972 18,088
Net income attributable to noncontrolling interests                 2,630 3,354 3,204
Distributions                 (2,537) (3,277) (3,112)
Purchases of ownership interests                   235  
Sales of ownership interests                 (12,951)   (765)
Amortization of equity compensation                 478 413 449
Adjustments to fair value                 (2,555) (236) (892)
Redeemable Noncontrolling Interests, Equity, Carrying Amount, End of Period 2,526       17,461       2,526 17,461 16,972
Noncontrolling Interests                      
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                      
Nonredeemable Noncontrolling Interest, Beginning of Period       $ 5,186       $ 4,161 5,186 4,161 3,393
Net income attributable to noncontrolling interests                 857 1,114 953
Distributions                 (817) (1,083) (942)
Purchases of ownership interests                   85  
Sales of ownership interests                 (5,272)   (134)
Amortization of equity compensation                 161 935 747
Adjustments to fair value                 (115) (26) 144
Nonredeemable Noncontrolling Interest, Beginning of Period $ 0       $ 5,186       $ 0 $ 5,186 $ 4,161