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Noncontrolling Interests Components of Noncontrolling Interests (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items]    
Redeemable and Nonredeemable Noncontrolling Interest $ 20,674 $ 21,133
Redeemable Noncontrolling Interests 15,882 16,972
Nonredeemable Noncontrolling Interest 4,792 4,161
Anchor [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable and Nonredeemable Noncontrolling Interest 9,644 10,934
BOS [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable and Nonredeemable Noncontrolling Interest 7,330 6,782
DGHM [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interests [1] $ 3,700 $ 3,417
[1] Only includes redeemable noncontrolling interests.