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Adoption of Accounting Pronouncements Adoption of Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Undistributed (gains) losses of equity method investments $ (8,341) $ (5,362) $ 318
Distributions in excess of current year income of equity method investments 2,924 552 0
Increase in other assets (372) (2,643) (4,979)
Net cash provided by operating activities 454,944 379,545 329,509
Distributions from other investments 28,379 21,843 24,202
Net cash used in investing activities (435,688) (332,658) (320,736)
Operating Lease, Right-of-Use Asset 20,800    
Operating Lease, Liability 20,400    
Finance Lease, Right-of-Use Asset 900    
Finance Lease, Liability 900    
Previously Reported [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Undistributed (gains) losses of equity method investments   (6,393) (2,316)
Distributions in excess of current year income of equity method investments   0 0
Increase in other assets   (9,872) (30,071)
Net cash provided by operating activities   370,733 301,783
Distributions from other investments   23,426 26,837
Net cash used in investing activities   (331,075) (318,101)
Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment 30,726 0 0
Accumulated other comprehensive (loss) income [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment [1]   25,019  
Accumulated other comprehensive (loss) income [Member] | Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment 30,726 0 0
Accumulated other comprehensive (loss) income [Member] | Accounting Standards Update 2018-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment (5,707) 0 0
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment (30,726) 0 0
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment 5,707 $ 0 $ 0
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect adjustment $ (1,000)    
[1] Upon adoption of ASU 2016-01 and ASU 2018-02 in the first quarter of 2018, we recognized a $25.0 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2017 and the one-time reclassification from AOCI to retained earnings for the stranded tax assets that were created in AOCI from the enactment of Tax Reform. See Note 3. "Adoption of Accounting Pronouncements" above for additional information.