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Investments Investments Table (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value Measurement [Domain] |  |
Schedule of Cost and Equity Method Investments [Line Items] |  |
Equity method investments | $ 77,484 | $ 82,584
Available-for-sale securities | 26,784 | 27,482
Cost method investments | 25,236 | 31,816
Total investments | $ 129,504 | $ 141,882
Maximum [Member] |  |
Schedule of Cost and Equity Method Investments [Line Items] |  |
Available-for-Sale Securities, Ownership Percentage | 25.00% | 25.00%
Cost Method Investments, Ownership Percentage | 19.00% | 19.00%
Equity Method Investments, Ownership Percentage | 24.00% |
Minimum [Member] |  |
Schedule of Cost and Equity Method Investments [Line Items] |  |
Available-for-Sale Securities, Ownership Percentage | 19.00% | 19.00%
Cost Method Investments, Ownership Percentage | 1.00% | 1.00%
Equity Method Investments, Ownership Percentage | 10.00% | 41.00%
Convertible debt securities [Member] |  |
Schedule of Cost and Equity Method Investments [Line Items] |  |
Available-for-sale securities | $ 11,232 | $ 10,038
Redeemable preferred shares [Member] |  |
Schedule of Cost and Equity Method Investments [Line Items] |  |
Available-for-sale securities | $ 15,552 | $ 17,444

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