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Accounting Pronouncements Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Undistributed gains of equity method investments $ (881) $ (685)
Distributions in excess of current year income of equity method investments 1,346 465
Decrease (increase) in other assets (9,672) (6,511)
Net cash provided by operating activities (7,705) 24,531
Distributions from other investments 6,221 5,983
Net cash used in investing activities (59,455) (32,904)
Scenario, Previously Reported [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Undistributed gains of equity method investments   (665)
Distributions in excess of current year income of equity method investments   0
Decrease (increase) in other assets   15,998
Net cash provided by operating activities   46,595
Distributions from other investments   6,428
Net cash used in investing activities   (32,459)
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 (30,700) 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 $ 5,700 $ 0