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Equity method and other investments Equity Method and Other Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |
Equity method and other investments | $ 226,309 | $ 224,611
Adjusted cost method investments |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method and other investments | 12,386 | 12,386
Other Ownership Interest |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method and other investments | 88,861 | 83,052
Deconsolidated Noncontrolling Entity |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method and other investments | $ 125,062 | $ 129,173

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