Annual report pursuant to Section 13 and 15(d)

Redeemable Noncontrolling Interests (Details)

v3.8.0.1
Redeemable Noncontrolling Interests (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
joint_venture
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Noncontrolling Interest [Abstract]      
Number of joint ventures with redeemable noncontrolling interest | joint_venture 2    
Redeemable Noncontrolling Interest [Roll Forward]      
Beginning balance $ 22,979 $ 19,218 $ 18,417
Contributions from noncontrolling interests 0 22,779 1,654
Distributions to noncontrolling interests (1,566) (21,881) (2,964)
Net income attributable to noncontrolling interests 2,338 2,242 2,227
Adjustment to arrive at fair value of interests (626) 621 (116)
Ending balance $ 23,125 $ 22,979 $ 19,218