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Summary of Significant Accounting Policies (Adoption of New Accounting Standards) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase to cash flows provided by operating activities | $ (24,128) | $ 101,543 | $ 29,489 |  |
Decrease to cash flows provided by investing activities | (778,859) | (263,071) | (465,028) |  |
Decrease to cash flows provided by finaning activities | 457,939 | 41,480 | 877,655 |  |
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments | 304,275 | 321,241 |  | $ 397,110 |
Total assets | 5,014,277 | 4,731,078 |  | 4,806,947 |
Retained earnings (deficit) | (2,472,061) | (2,470,564) |  | (2,394,695) |
Total equity | $ 1,064,115 | 914,249 | 1,059,684 | 990,118 | $ 1,101,330
ASU No. 2016-15 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase to cash flows provided by operating activities |  | 20,800 | 7,300 |  |
Decrease to cash flows provided by finaning activities |  | 20,800 | 7,300 |  |
ASU No. 2016-18 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase to cash flows provided by operating activities |  | 600 | 700 |  |
Decrease to cash flows provided by investing activities |  | $ 6,400 | $ 1,500 |  |
ASU No. 2017-05 | Impact from ASU |  |  |  |  |
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments |  |  |  | 75,869 |
Total assets |  |  |  | 75,869 |
Retained earnings (deficit) |  |  |  | 75,869 |
Total equity |  |  |  | $ 75,869 |

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