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Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Undistributed gains of equity method investments $ (1,628) $ (3,584)
Distributions in excess of current year income of equity method investments 1,450 552
Decrease (increase) in other assets (6,550) (3,862)
Net cash provided by operating activities 92,257 95,451
Distributions from other investments 15,927 9,300
Net cash used in investing activities (96,402) (94,017)
Scenario, Previously Reported [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Undistributed gains of equity method investments   (3,575)
Distributions in excess of current year income of equity method investments   0
Decrease (increase) in other assets   24,953
Net cash provided by operating activities   123,723
Distributions from other investments   9,843
Net cash used in investing activities   (93,474)
AOCI Attributable to Parent [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of new accounting principle in period of adoption (25,019)  
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of new accounting principle in period of adoption (30,726) 0
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of new accounting principle in period of adoption $ 5,707 $ 0