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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Accounting Standards Update 2016-01 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Additional income due to changes in accounting for equity investments | $ 89,000 | $ 1,300,000 | $ 3,200,000 |
Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | $ 3,806,000
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | $ 1,917,000
AOCI Including Portion Attributable to Noncontrolling Interest [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | 995,000 |  |  |
Accumulated Other Comprehensive Income (loss) [Member] | Adjustments for New Accounting Pronouncement [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 3,800,000 |  |  |
Retained Earnings [Member] | Adjustments for New Accounting Pronouncement [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 3,800,000 |  |  |

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